(2)表示迫使的动词
一般考三个， allow/ enable/ call, +sb. + to do
例：Besides providing clues to the nature of atoms, mineral analysis
A B
allows to speculate geologists about the ancient Earth.
C D
分析：allow...to do是固定短语,allow的宾语应在不定式之前,即把C改为: allow geologists to speculate。
(3)表示倾向…的形容词
be more likely to do 更有可能作某事
be inclined to do倾向于做某事
be liable to do 易于…的
be apt to do
(4)表示目的的名词，一共有7个这样的词，这一条也是最重要的。
固定的句式：
the purpose , the purpose of sth is to do sth.
the objective 目标
aim
goal
reason理由
function功能
intension意图
例：The function of Louis Sullivan's architecture was providing
A
large uninterrupted floor areas and to allow ample light into the interior.
B C D
分析：the function to provide, A错
例：The chief goal of biochemistry is for understanding the structure
A
and behavior of the carbon-containing compounds
B
that make up various components of a living cell.
C D
分析：the chief goal is to understand, A错