I thought vs. I thought that
27576
"Assume you are given ..." or "Assume that you are given ..."?
117150
How could it had happened vs How could it have happened
7614
"Whether or not" vs. "whether"
133115
"will" or "would"
43463
Using "I don't think" to express an opinion
15180
Use of "would be" vs. "is"
68602
A case of optional “that”: “check the” vs. “check that the”
37609
I'm positive that vs I strongly believe that
64030
Nuances in variants of “I should/would/∅ think so”
92634
Those vs They vs That
61303
"Infer" vs. "imply" — can "infer" imply "imply"?
50024
"Actually" vs "really"
45286
“...than I am” vs. “...than me”
82398
I 'was' or I 'were'?
92516
"Might have" vs "could have"
26800
When to use 'which' or 'in which' or 'that' (as relative pronouns)?
133685
Use of "though" versus "however"