1 I visited some interesting places in Ho Chi Minh City , such as the Independence Hall , Nha Rong Harbor , the zoo and Dam Sen park .

2 I have met my friend , Lan . She took me to the restaurant where we've tried different kinds of food : seafood , specialities of Ho Chi Minh City .

3 I will visit Tao Ban park tomorrow morning on Tuesday in the morning .

4 I've bought a lot of souvenirs .

- Quá khứ đơn .

( + ) S + V(quá khứ) + O ...

( - ) S + did + not + V-inf + O ...

( ? ) Did + S + V-inf + O ... ?

- Tương lai đơn .

( + ) S + will + V-inf + O ... 

( - ) S + won't + V-inf + O ...

( ? ) Will + S + V-inf + O ... ?