151 must，have to 和 need 用于疑问句
| |
向有权威的人询问 |
外界权威 |
| 将来时 |
must I? 等 |
shall/we have to? |
shall I/we need to? |
| |
need I? 等 |
will he等 + have to |
will he等 + need to |
| 现在时 |
must I? 等 |
do I等 + have to? |
do I等 + need to? |
| |
need I? 等 |
does he等 + have to? |
does he等 + need to? |
| |
|
have I等 +(got) to? |
|
| |
|
has he等 +(got) to? |
|
| 过去时 |
did he等 + have to? |
| |
did he等 + need to? |
| |
had he等 + got to? |
need？和 must？都意味着说话的对方是有关的权威。need？还包含着说话人希望得到否定回答的含义：Must I go，mother？和 Need I go，mother？含义相同，但在后一问句中，说话人希望他的母亲回答说“不”。need 的另一种疑问式do I need？等也有同样的用法。注意以下各种可能的回答：
—Shall I have to go？
—Yes，you will．／No，you won't．
—我必须去吗？
—是的，必须去。／不，不必去。
—Have I got to go？
—Yes，you have．／No，you haven't．
—我必须去吗？
—是的，必须去。／不，不必去。
—Does he have to go？
—Yes，he does．／No，he doesn't
—他必须去吗？
—是的，必须去。／不，不必去。
—Need I go？
—Yes，you must．／No，you needn't．
—我需要去吗？
—是的，必须去。／不，不需要去。
—Must I go？
—Yes，you must．／No，you needn't．
—我必须去吗？
—是的，必须去。／不，不需要去。 |
