Past perfect tense (We’ll study this in Side by Side Ch. 8)
If you express something that happened (finished) in the past and say a specific time (like yesterday) or if you give specific details, you must use the past or past continuous tense. (See Side by Side textbook p. 40, 47 for examples.)
Example 1: Q: Have you gone to the bank? (present perfect)
A: Yes, I have. (present perfect short answer)
I went to the bank yesterday. (past tense due to specific time)
Neg: No, I haven’t. OR No, I didn’t. OR No, I haven’t gone yet. OR Not yet. OR No.
Example 2: Q: Have you gone to the bank? (present perfect)
A1: Yes, I’ve gone to the bank already. (pres perf can be used due to unspecified time)
OR A2: Yes, I went to the bank already. (past can also be used with an unspecified time)
OR Yes, I did. OR Yes, I already went. OR Yes, I went already. OR Yeah.
Notice the difference in meaning in these 3 statements:
I taught ESL for over 8 years. (past, finished)
I’ve taught ESL for over 8 years. (present perfect, still happening)
I’ve taught ESL. (present perfect, finished)
If something began in the past and continues now (in the present), you MUST use present perfect or present perfect continuous to talk about it.