1.they(have)..... lunch in the cafeteria now 2. my little sister(drink)..... milk every day 3.the doctor sometimes(return)..... home late 4.he (write)...... a long novel at present 5.there(be).....a lot of noise at the fair yesterday 6.it (take)........ me 5 minutes to walk to school last year. 7.they (not speak)....... to each other since they quaralled. 8.i (try)...... to learn English for years. but i (not succeed)........yet. 9.i (not see)....her since last week. 10.john (do)... his homework already.

$Đáp$ $án$ + $giải$ $thích$:

`1`. are having

`->` `DHNB`: `N`ow `->` chia HTTD

`-` `C`ấu trúc: S + am/is/are + V-ing +....

`2`. drinks

`->` `DHNB`: `E`very day `->` chia HTĐ

`-` `C`ấu trúc: `S` + `V`-`s`,`es` + ....

`-` `C`hủ từ "my little sister" là số ít ta thêm đuôi s,es

`3`. `R`eturns

`-` `DHNB`: `S`ometimes `->` chia HTĐ

`-` `C`ấu trúc: `S` + (TTTX) + V-s,es

`4`. is writting

`->` `DHNB`: `A`t present `->` chia HTTD

`-` `C`ấu trúc: `S` + am/is/are + `V`-ing

`5`. was

`->` `DHNB`: `Y`esterday `->` chia `QKĐ`

`-` `C`ấu trúc thì Qúa khứ đơn đối với động từ tobe:

`+` `S` + was/were + `N`/adj

`6`. took

`->` `DHNB`: `Y`esterday `->` chia `QKĐ`

`-` `C`ấu trúc: `S` + `V2` / `ed` + ...

`V1`: `T`ake `->` `V2`: `T`ook

`7`. haven't spoken

`->` `DHNB`: `S`ince `->` chia HTHT

`-` `C`ấu trúc : `S` + have/has + V3/ed +....

`-` `C`hủ từ they là số nhiều `->` `have`

`-` `V1`: Speak `->` `V3`: `S`poken

`8`. `H`ave tried / haven't succeeded

`->` `DHNB`: `F`or years và yet `->` chia HTHT

`-` `C`ấu trúc: `S` + have/has + V3/ed + .....

`-` `C`hủ từ "I" là số nhiều `->` `have`

`9`. `H`aven't seen

`->` `DHNB`: `S`ince `->` chia HTHT

`-` `C`ấu trúc: `S` + have/has + V3/ed +...

`10`. `H`as done

`->` `DHNB`: `A`lready `->` chia HTHT

`-` `C`ấu trúc: `S` + have/has + V3/ed +...