now

1.下面两句意思相同：

• Now you have come, you may stay here.
• Now that you have come, you may stay here.

2.下面两句里的in可有可无：

• I shall probably be in Moscow (in) a month from now.
• What will the world be like (in) a thousand years from now?

3.I have known him for fifteen years now里用now比不用now语气重些。

4.Having failed several times, he now tried a new plan里用now比用then生动。