aspectuality(perfective or imperfective)
67182
reference time,situation time
22902
Difference in meaning and use of future perfect forms
15882
Singular or plural verb form where subject includes a "parenthetical" element
151676
Being characteristic is transitive
114989
The logic behind present perfect/infinitive + present perfect
141385
Singular or plural verb after parenthetical material containing a conjunction?
49302
before/after + past or past perfect
100002
Past Simple vs. Present Perfect
51020
What exactly is the word "there" in an existential construction? And related questions
49025
Can the past simple or the present perfect fit in this example with yet
77813
Using perfect constructions after "since"
123638
The correct omission of the definite and indefinite articles
7051
Appositives with possessiveness?
88444
"That is" vs. "i.e."
118617
Completeness and Incompleteness
66004
until + perfect present / present
107172
Countable nouns and determiners