1. We were playing sports. Our father was gardening => While.................................................. 2. It is necessary for me to go to the hospital now. => I need................................................. 3. You should drink more water to stay hydrated. => You ought to...................................... 4. I can play the piano. => I am able..........................................

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`1` While we were playing sports , our father was gardening .

`-` While + S + was/were + V_ing + O , S + was/were + V_ing + O : Khi ai đó đang làm gì , ai đó đang làm gì .

`2` I need to go to the hospital now .

`-` S + need + to V : Ai đó nên làm gì .

`3` You ought to drink more water to stay hydrated .

`-` should + V_inf `=` ought to + V-inf : nên làm gì .

`4` I am able to play the piano .

`-` can + V-inf `=` be able + to V : có khả năng làm gì .

`1.` While we were playing sports, our father was gardening

`***` While   +  QKTD  , QKTD  : 2 hành động xảy ra song song

`@` QKTD: `(+)` S  +  was/were  +  V-ing  +  O

`2.` I need to go to the hospital

`-` need  +  N / to_V: cần cái gì, làm gì

`3.` You ought to drink more water to stay hydrated

`-` ought to  +  V-inf  =  should: nên làm gì

`4.` I am able to play the piano

`-` be able to= can: có thể