136. mean to do, mean doing  

mean to do 打算,想要做某事;
mean doing 意思是,意味著。例:By this I mean giving the students more practice.

137. die from, die of  

die from 表示死于(槍)傷,虛弱,過度勞累,飲食過度等;
die of 表示死于疾病,饑餓,寒冷,年老,憂愁,失戀等精神因素。例:die of hunger and cold

138. pay for, pay back, pay off  

pay for 為……付錢,例:pay for the book;
pay back 還錢,但不一定還清;
pay off 還清,例:pay off the debt

139. divide, separate  

divide 把一個整體分成幾部分,例:divide the apple;
separate 把連在一起的個體分開,例:separate the houses

140. arrive, get, reach  

arrive 不及物動詞,后接in(大地點(diǎn)),at(小地點(diǎn))。例:arrive in Beijing
get 不及物動詞后接to,例:get to Beijing
reach 及物動詞,例:reach Beijing