not until是直到…才的意思,你这句话是要说这个男孩直到他妈妈回来才去睡觉,但是我不太明白你说的come 这句话可以说The boy did not go to bed until his mother came back.
倒装句是not until位于居首,句子要倒装例如,Not until she came back did I know she was OK.
强调句是对not until 强调,例如 It was not until 11 o'clock that he returned to his home.
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