sarah….(collect)plenty of information for the assignment recently
2/the lives of VN farmers…(change)dramatically since the invention of the harvesting machine
3/he…..(teach)EL in this university for 3 years
4/that university……(not hold) any seminars since september
5/his father-in-law…(do)research since last year
6/my classmates and i …….(just/receive)the results of our recent exams
7/i……(read)all the books on the reading list today ,so i have the notes now
has collected
have changed
have taught
hasn’t held
has done
have just received
have read
Thì HTHT: S+have/has+VPII
`~rai~`
$\begin{array}{I}\text{1.has collected(recently->HTHT)}\\\text{2.have changed}\\\text{3.has taught(for+a period of time->HTHT)}\\\text{4.hasn’t held(since+a point of time->HTHT)}\\\text{5.has done}\\\text{6.have just received(just:chỉ hành động vừa mới xảy ra->HTHT)}\\\text{7.have read}\end{array}$