Need to /need 's difference???

Beware is a verb whereas aware is an adjective.
Beware - to be cautious; exert caution
e.g. Beware of the dog. We have to beware of the icy patches on the road.
Aware - means - having knowledge
e.g. Are you aware that I am coming to the party?

tease/mock/sneer all are verbs. Mock/sneer are also nouns.

tease - to make fun of; mock playfully; to arouse hope or desire without affording satisfaction; to annoy.
e.g. She is teasing her mother for more candies. Don't tease me!
mock - to treat with ridicule or contempt; to frustrate the hope of; disappoint
e.g. They mocked at the idea. He mocked his wife's efforts at cooking.
sneer - to speak in a scornful, contemptuous manner, with derisive facial expression
e.g. What are you sneer for? He sneered at our attempts to improve the situation.

Tease is used in a moderate manner.
Mock and sneer are used in a more serious manner.

2009-12-18 13:02:08 補充：
What are you sneering for?

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beware通常是指當心/小心一些危險的東西，aware通當是指對某事情注意/留心。需然最基本的中文解釋好似都是注意，不果簡而言之叫人beware是警告，aware是提醒。

tease是取笑，mock是嘲笑，sneer是譏笑
如果連中文都看不出分別唯有請你問埋中文知識。