1)在既指人又指事物的两个或两个以上的先行词后面。例如：
they are talking about the people and countries that they had visited.
2)在限制性定语从句中有形容词最高级的先行词后面。例如：
he is the best student that i have ever met.
3)在以“it is...”,“it was...”等开头的强调句中，和相应的疑问句中。如：
what is it that he wants?
4)在only, all, little的后面
this is all that i know.
5)在no, every, some和any等词后面，也包括在它们的复合词在内。如：
there is no person that is always in the right.
is there anything that i can do for you?
近义词辨析
beautiful, good looking, handsome, lovely, pretty
这组词均含有“美丽”、“漂亮”、“可爱”的意思。
beautiful
指能不仅给人带来感官上的快乐，而且通过感官产生思想和灵魂的愉悦，在同类词中层次最高。
she was even more beautiful than i had remembered.她比我记忆中的她更漂亮了。
good looking
不如handsome, pretty意思强烈，指一般的“好看”或“悦目”。
that good瞝ooking young man visited the house once or twice a week.那个长相不错的年轻人一星期光顾一两次。
handsome
通常是一种客观的不带感情色彩的'评价。一个人如被形容为handsome,是指此人外貌符合观察者的要求，但不激发更深层的感受。
he looked very handsome in his dark suit.他穿深色西装显得非常英俊。
lovely
比感官的快乐更进一步，是强调纯粹情感上的愉悦，指觉得某人或某物“可爱”。
mary has two lovely daughters.玛丽有两个可爱的女儿。
pretty
pretty也是“漂亮、可爱”的意思。很少形容大而有影响力的事物，多形容事物不以其优秀、完美而以小巧、优雅、精致见长，使人容易接受并喜爱。
her boyfriend believes that she is the prettiest girl in the town.她男朋友觉得她是镇上最漂亮的女孩。
书香门第
