demand
1.demand（名词）后面接for。例如：There is a great demand for eggs. 但demand（动词）是及物动词，后面不可接for，如He demands more help里不可在demands后面加上for。
2.demand不论用作名词或动词，后面都可以接以that引导的从句，那从句里用shall或should，或现在虚拟语气。例如：
- He makes the demand that she shall leave the place at once.
- He makes the demand that she should leave the place at once.
- He makes the demand that she leave（不用leaves）the place at once.
- He made the demand that she should leave the place at once.
- He made the demand that she leave（不用left）the place at once.
- He demands that she shall leave the place at once.
- He demands that she should leave the place at once.
- He demands that she leave（不用leaves）the place at once.
- He demanded that she should leave the place at once.
- He demanded that she leave（不用left）the place at once.
3.demand（动词）不可把指被要求的人的词做宾语，如不可说I shall demand him for an answer或I shall demand him to answer，该说I shall demand of him to answer或I shall demand an answer of him或I shall demand that he shall（或should）answer或I shall demand that he answer （不用answers）。
4.demand（动词）不可把指被问的人的词做宾语，该在那个词的前面加上of，如We must demand of him whether he has heard from her recently里的of不可省去。注意下面一句里也有of：
'What do you want?' he demanded of her.
demand作“问”解语气很重，有“责问”或“诘问”的意思。
5.demand（动词）后面接不定式，不接动名词，如He demanded to see my library里的to see不可改作seeing。
