`**`Thì quá khứ đơn với động từ TOBE : 

`+` was : he , she , it , danh từ số ít

`+` were : I, they , we , you , danh từ số nhiều.

Áp dụng công thức :

`+` Was / were + S +....?

`+` S + was / were +...

`+` Who + was / were + S +.

.?

`+` Wh - ques + was / were + S +...?

Bài tập : 

1.B ( DHNB: yesterday )

2. C ( DHNB: yesterday )

3. A ( DHNB: now - thì HTTD , Wh + are + you , we , they +..?)

4. B ( DHNB: yesterday )

5. C ( DHNB: last night )

1. was (yesterday-> thì QKĐ, "it" đi với to be "was")

2. Were (yesterday-> thì QKĐ, "you" đi với to be "were)

3. are (now-> thì HTTD, "you" đi với to be "are")

4. was (yesterday-> thì QKĐ, "I" đi với to be "was")

5. was (last night-> thì QKĐ, "your brother" là danh từ số ít, đi với to be "was")