用英语解释下列句子 急急急！速度发 1.Why don't you pump the bike? 2.Saving water is very important.

3.It took me 5 years to learnEnglish.

4.We can't live without water.

5.I didn't go to bed until he came back.

Tell me the reason that you don't ride a bicycle.
We should not waste water.
I use 5 years to study English
Our lives need water.
He came back , then I went to bed.

why not come here by bike why don't you =why not

3.It took me 5 years to learnEnglish. I spend 5 years lerning english 4.We can't live without water. we mast live with water 5.I didn't go to bed until he came back. until he came back I still didn't came back

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