词汇点睛
decide v.决定;作出判断
观察
Li Ming decides to buy a new bike.李明决定买一辆新自行车。
l can't decide which book to buy.我不能决定买哪本书。

探究 
decide的具体用法如下:
(1)decide to do sth. = make up one's mind to do sth.，意为“下定决心做某事”，其否定形式是decide not to do sth.。如:Tom decided to go home during the Spring Festival.汤姆决定春节期间回家。
(2)decide +疑问词+不定式如:Did she decide when to start?她决定什么时候出发了吗?

as usual像往常一样
观察 Yesterday evening, I ate ten donuts as usual.昨天晚上我像往常一样吃了十个面包圈。
探究 usual是形容词，意为“通常的”,常构成短语as usual，意为“像往常一样”，表示一种习惯性动作的重复。
拓展 usually作副词，意为“通常”。如:l usually go to school by bike.我通常骑自行车去上学。