12. is learning - am reading
13. is taking
14. help
15. doesn’t want - wants 
16. are seeing
17.don't go
18. like - practice - am taking - is waiting

- Thì hiện tại đơn

(+) S + V/Ve/es

(-) S + do/ does + not + V

(?) Do/ Does + S + V?

- Thì hiện tại tiếp diễn

(+) S + am/is/are + V-ing

(-) S + am/is/are + not + V-ing

(?)

Hỏi: Am/ Are/ Is (not) + S + V-ing?
     Đáp: – Yes, S + am/ are/ is.
              – No, S + am not/ are not/ is not.

Hỏi: WH- + am/ are/ is (not) + S + V-ing?

Đáp:  S + am/is/are (not) + V-ing

$\\$`12.` is learning / am reading
$\\$`13.` is taking
$\\$`14.` help
$\\$`15.` doesn’t want / wants 
$\\$`16.` are seeing
$\\$`17.` don't go
$\\$`18.` like / practice / am taking / is waiting

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _


$\\$`1.` Thì HTĐ:
$\\$`(+)` S `+` V (s/es) `+` O.
$\\$`(-)` S `+` do / does `-` not `+` V.
$\\$`(?)` (Wh-) `+` Do / Does `+` S `+` V `+` O?

$\\$`2.` Thì HTTD:
$\\$`(+)` S `+` am/is/are `+` V `-` ing
$\\$`(-)` S `+` am/is/are `+` not `+` V `-` ing
$\\$`(?)` (Wh-) `+` Is / Am / Are `+` S `+` V `-` ing `+` O?

$\\$`-` I `+` am
$\\$`-` He / She / It `+` is
$\\$`-` We / You / They `+` are