I am very much confused with the usage of Have-Had-Has. I know "have" is used in Present perfect whereas "had" is used in past perfect. Then what about the usage of "have had" combination in a sentence?  Where do I have to use them?   How I know whether my usage is correct or not?
124129
How does the usage of "have had" and "had" differ?   Here is my example from my other question:     People who have had their belongings taken will turn into miserable people.   Here are the things I seem to have gotten from StoneyB's answers:   Have had is used for one-time occurrences, but had can be used for such occurrences as well Have or simple present is used for something more habitual   So does that mean have had and had are interchangeable?     People who have had their belongings taken will turn into miserable people. [= "People who had their belongings taken will turn into miserable people."]   Is this assumption correct, or do they imply different meanings?  So a sentence like "people who smoke will get sick" means that a habitual smoker will get sick, but a sentence like "people who have smoked will get sick" means that if you have smoked even once in your life, you'll get sick. Is this exact?
91746
Accourding to ,   We often use "been to" when we refer to completed visits to a place:  Have you ever been to Budapest?  Not: Have you ever gone to Budapest?  If the visit is not complete, we use "gone to".  Joan’s just gone to the shop. She’ll be back in about ten minutes. (Joan has not yet returned from the shop.)  Joan’s just been to the shop. She bought some cakes. Would you like one? (Joan has returned from the shop.)  Now, does that rule apply to the  "Have been on a trip" &amp; "Have gone on a trip"?  So, "I have been on a trip" (I completed the trip &amp; currently I am staying at home)  "I have gone on a trip" (I haven't completed the trip &amp; currently I am on the trip)  And what about "gone crazy" &amp; "been crazy".  Does "He has gone crazy" mean now he is still crazy?  Does "He has been crazy" mean now he is not crazy any more?  Are there any differences between "Have been on a trip" vs "Have gone on a trip" and "Have been crazy" vs "Have gone crazy"?  Note: I am not asking about "been to" or "gone to". I am asking about "been on a trip" &amp; "gone on a trip". Do we apply the same rule of "been to" or "gone to" to "been on a trip" &amp; "gone on a trip"?  Note2:  seems to prove that my thinking is right.
2627
Should I use the past tense with did? For example, I was to say:     The important question is: Did they knew what it means or not?   Or should I say:     The important question is: Did they know what it means or not?   In other words: Should I use past tense with did?  I looked at this:    but it didn't really answer my question.
89880
I was told that if an action is completed once in the past, the simple past is used. Ex:  I saw that movie.  If the action is completed more than once, the present perfect tense must be used. Ex:  I have seen that movie twelve times.    So, "I have seen that movie twelve times on Tuesday." is correct and "I saw that movie twelve times on Tuesday." is incorrect?
2395
I noticed that my American friends tend to use the past perfect form when they use the verb mention in its past form, almost despite of the context of the sentence. I hear them say  "you had mentioned" a lot more often even in situations where the use of simple past would have been perfectly fine. Have you noticed it too and is it one of those unwritten rules, or is there a more formal explanation to it?  It seems like there was more verbs like that, but I am having a hard time remembering it now. If I do, I will edit the post and likely change the title to accommodate other verbs.
122562
Before I met her I had a poor opinion of her.   As person had a poor opinion before a particular time in past (before He met her) so I think there should be had had.   There are some more example like this:   Before I went to the university, I worked/had worked as a carpenter for 5 years. Before I opened the door, I put/had put the key in the lock. Before I opened the door, I looked/had looked carefully into the barn for snipers.   In all these sentence, for me, it should be perfect tense.  I asked that question on another platform where I was told that if sequence of past event is obvious and sentences uses "before"and "after", we often use past tense. Which means we should use past tense in all these sentences. But I have another sentence "The train had left before I reached the station." If I follow above mentioned rule there should be "left" instead of "had left". But I am damn sure this sentence is correct with "had left".   Am I correct?  Thank you
38635
"Why is your baby's face so dirty?"   "She _______ (eat) chocolate"   I know, the answer is Present Perfect Continuous - has been eating. What about the Present Perfect - has eaten? Can't we use it in similar situations?
8923
I don't know what is the difference between using "I have got" and "I have" For example:      He's got broad shoulders.    Is it possible to say:      He has broad shoulders.    If yes, so what is the difference?
64090
Possible Duplicate:                 What is the difference between does have and has? For example, compare she does have a car and she has a car.
2303
Does and has both are used with singular pronouns (He has the bottle , He does play cricket , etc) whereas Do and have are used with plural pronouns ( They have the bottle , Do they like cricket? , etc)  But still we use Does with have ( She does have a car ). Why? Shouldn't it be     She does has a car.
24689
I'm interested to know why we use had better for recommendation. Technically we're speaking of an action that hasn't yet occurred. Like he had better leave a tip means he hasn't yet left a tip, but I suggest he do.    Why do we use the past tense had if it has nothing to do with the past? Why do we not use the subjunctive here? (He have better leave a tip.)
40369
What are the difference between the following sentence?    I ate apples. I have eaten apples.    When should we use simple past tense? When should we use perfect past tense?
30774
Context : Let say, I have just joined to a company and I want to ask my new friend how long he has been working here.  Using Present perfect:     How long have you worked here ?   Or   using Present perfect continuous tense ?     How long have you been working here ?   According to the image below:    Image credit:   So my answer is using present perfect continuous because I think he started in the past and he's still working at that office now. Am I right ?  Please include the reason on your answer as well.
2797
Is it legal to use has in the following question?     Would you tell me please whether either my friend Joey or me has to visit the manager tomorrow?   Or, instead, should I use have rather than has?
97929
I saw a sentence  She hoped to have done  Or a sentence, created with the same structure. I don'tunderstand how it works. Then I saw a full version of it:  She hoped that she had done  So, it's like a combination of Past Simple(hoped) + Past Perfect(had done) but combining them we can't have Past Perfect, we have  only perfect infinitive.  When I later saw  She can't have done  I didn't understand it, too. Since then I've been trying to create a full version of it which would be clear for me. I tried  It can't be possible that she has done - I was told it was incorrect  It can't be true that she has done - I was told it was incorrect, too  I also have such variants:  It can't be real that she has done  There can't be a possibility that she has done it  There can't be a probability that she has done it  Is there any sentence among those I wrote which can be equaled to "She can't have done"?
14411
Here I know I have one present perfect and present perfect continuous sentence.   I have lived in Europe for 2 years. I have been living in Europe for 2 years.   Can you use both of them interchangeably? What is the exact difference between them? To me both suggest that the person is still living in Europe.
78731
What is the difference in meaning between the two examples below?   When she returned home from office, she was shocked to see that her husband and daughter were missing. (Simple Past)  When she returned home from office, she was shocked to see that her husband and daughter had been missing. (Past Perfect)    FIRST QUESTION: For me example #1 gives only idea of Status of her missing husband and daughter and example #2 gives idea of completed action/situation of missing husband and daughter before she reached home. Is this right? SECOND QUESTION: Is example #2 past perfect or past perfect continuous?