1) You shouldn't go out today. It’s too cold.
2) Can/may I take your fountain-pen? – Do, please.
3) We can not carry the bookcase upstairs. It’s too heavy.
4) When could you come to see us? – I can come only tomorrow.
5) Shall I write a letter to him? – No, you needn't. It is not necessary.
6) Marry must finish the work at once.
7) Can you cut something without a knife?
8) Peter must return the book to the library. We all want to read it.
9) Why can not you understand it? It so easy.
10) Should we do the exercise at once?
11) Can you pronounce this sound?