Since last August ,the old lady____(have)had headaches three
Since last August ,the old lady____(have)had headaches three
Since last August
—How long have you had the bike?—Since last week什么时态
three years have passed since they met last time.
The old man had three sons,all of____died during war
At last the three-year-old boy was____(救)
She have bought the computer since three years ago
I have studied English or three years since I had come here.
改正句子中的错误.i have studied English for three years since i had
l have been studying for the test since last night
How have you been?It had been quite some time since we last
The receipts have increased since last year.since是什么词性..为什么