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1. require 强调根据需要或纪律、法律等提出的要求。如:
The situation there requires that I should take effective measures.
2. demand 一般指理直气壮地提出强烈要求(或不允许对方拒绝的要求)。不用于demand sb. to do sth.结构。此外，demand还可用作名词。如:
He demanded an immediate answer from me.
3. request 是正式用语，指非常正式有礼貌地请求或恳求(多含担心种种原因导致对方不能答应的意味)。request还可用作名词。如:
In the invitation， he requested that my family should attend his wedding.
【词条3】suffer
【点拨】suffer
vt.遭受，经历，后常跟defeat， hunger， loss， pain， poverty等词作宾语。如:
They have been suffering poverty since their unemployment.
The enemy has suffered a sharp defeat and huge losses.
vi. 受损失；受痛苦
If you break your promise， your reputation will suffer a lot.
He suffered terribly when his parents died in the accident.
【拓展】suffer from意为"受……折磨，受……之苦"。如:
Workers in this factory suffered from overwork.
A lot of old people suffer from heart disease.
suffering n. 疼痛，痛苦， 常用作复数，表示"种种痛苦(苦难)"。如:
He died without much suffering.
She keeps complaining about all her sufferings.
经典短语透视
【短语1】take...for granted
【点拨】take ... for granted 想当然，认为……理所当然，对……不予重视。take之后可接sth. / it作宾语:take sth. for granted 视某事为理所当然；take it for granted that认为……理所当然， it 为形式宾语，真正的宾语为that-clause。如:
He takes everything his parents do for him for granted.
Mother often tells me not to take things for granted.
You can’t take it for granted that they’ll behave themselves.
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