review the gammer

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语法复习

表示现在的副词: Now, today, always, usually, often, sometimes,
never.
表示过去的副词: Yesterday, the day before yesterday, last
night/year/week.
表示将来的副词: Tomorrow, the day after tomorrow, next
week/month/year
例句: 1: he always does his homework after supper.
2: Lucy played volleyball yesterday.
3: they are going to the movies the day after tomorrow.
Have to 和must 的用法比较:
(1): have 有人称和数的变化,而must 没有.
He has to see the doctor
He must see the doctor.
( 2): have 表示客观需要,must 表示主观需求.
I must go now; I am looking after my sister.
I have to have a piano lesson.
(3): have to 的否定形式用助动词,(do did does will),
must 的否定形式不用mustn’t , 而用needn’t 或 don’t have
to
you don’t have to come = you needn’t come.