日常用语（五）

1．We'll have to buy some more bricks．

2．I should finish the floor now．

3．I think we should paint it white．

4．．．．we must stop people walking on this floor until it's firm．

5．It may be necessary to put up a notice saying“Keep off”．

6．I ought to do some studying，as I've got masses of work to do，butI think I'll be too tired．