instead of(=in place of)代替，而不是…
instruct…in(=teach)教，指导，训练某人…
insure…for 把…保险(多少钱);ensure 使安全;assure…(of)使…确信，保证
insure…against 保险…以防
intend…for 打算把…给
(be)intent on 专心致志，坚决
in the interests of 符合…的利益;be interested in 对…感兴趣
interfere in 干涉;interfere with 打搅，干扰
at intervals 每隔一会儿，每隔一段距离
intervene in 干 预
invest in 投 资
be involved in(=become connected or concerned)卷入，参加
by itself(=alone，without help)单独地，靠自己
in itself 本身;of itself 自发，自然
be jealous of 妒 忌
