Is it grammatically correct to change tense in a sentence?
11264
"He didn't know where New Jersey was"
55425
Tense for an event that occurs as you read it
151946
"Change their positions" vs. "change their position"
100914
present perfect + past simple in the same sentence
33742
Does using "did" to form the past tense make a difference?
60970
Conditional sentences - which is correct?
100002
Past Simple vs. Present Perfect
152550
present tense with past perfect?
29501
Is it acceptable to use "is become" instead of "has become"?
119011
tense and time and composite sentence
157640
Present Perfect: Yes or No?
6340
"yet" vs. "already" with present perfect
96368
Simple Past vs. Present Perfect
98966
Is it correct to say "We start tomorrow"? Shouldn't it be "We are starting tomorrow"? (present simple vs continuous for future event)
104245
did + present tense (or ) Past tense of the verb
88753
Examples/references for not changing tense when using reported speech
12019
Can we use the present perfect in this case?