`1` is

- V-ing + V số ít

`2` isn't

`3` Are many people

`4` is

`5` aren't

`----`

* Thì hiện tại đơn : 

`( + )` S + am/is/are + ...

`( - )` S + am/is/are + not + ...

`( ? )` (WH-words) + am/is/are + S + ...?

*Note: 

- I : am

- She/He/It/Danh từ số ít : is

- You/We/They/Danh từ số nhiều : are

`@` lg

Surfing ________ (be) fun, but it can be dangerous.

`=>` is

Rock climbing ________ (not be) an easy sport.

`=>` is not

________ many people_________(be) scared of extreme sports?

`=>` Are many people

Safety equipment ________ (be) important for all extreme sports.

`=>` is

My friends and I ________ (not be) scared of trying new sports.

`=>` are not

`---`

`@` Thì HTĐ với tobe:

`(+)` S + is/are/am + .....

`(-)` S + is/are/am + not+ ....

`(?)` ls/Are/Am + S + .....

`**` is + He/She/lt

`**` am + l

`**` are + You/We/They