1) I (see) this film in 1999
2) I (see) this film since 1999
3) they (have) dinner when I came
1) I (see) this film in 1999 2) I (see) this film since 1999 3) they (have) dinner when I came
By Iris
By Iris
1) I (see) this film in 1999
2) I (see) this film since 1999
3) they (have) dinner when I came
1) I (see) this film in 1999
=> saw ( năm 1999 là quá khứ nên chia ở thì QKĐ )
2) I (see) this film since 1999
=> have seen ( since 1999 dấu hiệu của thì HTHT )
3) they (have) dinner when I came
=> were having
1.saw(dấu hiệu nhận biết là in `1999`)
2.have seen(dấu hiệu nhận biết since `1999`)
3.were having(dấu hiệu nhận biết when I came)