It depends on whether we have enough time.强点划线部分,whether we have enough time划线
He was at home at six o'clock.强调划线部分at six o'clock划线
改为否定句：
1.Both of the brothers work as farmers.
2.He reads English every morning.
3.It is necessary for him to improve his handwriting.
4.The stuents have done everything for the meeting.