Question

将下列陈述句改写为否定句，并就对划线部分进行提问。

1.You must pick the strawberries in the garden(划线部分：in the garden)

2.Mark must take the umbrella with him.(划线部分：Mark)
3.You must go out at eight o'clock.(划线部分：eight o' clock)
4.You must open the door at night(划线部分：open the door)

Answer 1

You mustn't pick the strawberries in the garden.
Where must you pick the strawberries?
Mark needn't take the umbrella with him.
Who must take the umbrella with him?
You mustn't go out at eight o'clock.
What time must you go out?
You mustn't open the door at night.
What must you do at night?
must是情态动词，只有一种形式，表示必须，它的过去式和现在式（原形）同型，没有分词形式。希望我能帮助你解疑释惑。

Answer 2

1.改否定句:You needn't pick the strawberries in the garden
划线部分提问：where do you need to pick the strawberries ?
2.改否定句.Mark don't have to take the umbrella with him.
划线部分提问：who need to take the umbrella with himself ?
3.改否定句:You can't go out at eight o'clock.
划线部分提问：when do you have to go out?
4.改否定句You shouldn't open the door at night
划线部分提问：what can't you do at night?
很高兴为您解答疑难，如有不懂之处，可以继续追问，谢谢

追问

must 去哪了？