Must i stay at home?No,you needn't.
You don't need to look after her sister.=You don't need to take care of her sister.
They worked until i came back.
They didn't work until i came back.
I don't think i am improving.
I am sorry to hear that.
Must i stay at home?No,you needn't.
You don't need to look after her sister.=You don't need to take care of her sister.
They worked until i came back.
They didn't work until i came back.
I don't think i am improving.
I am sorry to hear that.
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