"never did before" vs. "has never done before"
109193
Tense when saying "This is the first time" you've been somewhere
37239
What does "had had" mean? How does this differ from "had"?
68670
"There are no comments" vs. "There is no comment"
40372
"then" vs "and then"
108964
Difference between "I haven't" and "I've not" etc
71914
"Didn't use to get" or "Didn't used to get"?
40495
What's the difference between "has been living" and "has lived"?
15721
"Is it proved that ...?" vs. "Has it been proven that ...?"
141333
"A year ago" versus "a year back"
15527
Simple Past Vs Past Continuous
118206
Simple past vs. past perfect
86776
Difference between "did + verb" and just "verb+ed"
62252
Simple past vs Perfect Past
65426
Difference between Simple Past and Past Perfect
104764
Use of Past Simple vs Past perfect in sentences with since
29501
Is it acceptable to use "is become" instead of "has become"?
97227
"Has" vs. "have"