1.在表示建议,要求,命令,想法的动词后的从句里,用should + 动词原形,should 可以省略.如 advise,agree,command,decide,demand,determine,grant,indicate,insist,order,prefer,propose,request,require,stipulate,suggest,urge,vote.常考到的是:suggest,advise,demand,require,propose,insist,order,request.<br>His doctor suggested that he (should) take short leave of absence.<br>The author proposed that TV (should) be turned off at least one hour every day.<br>2.在表示建议,要求,命令,想法的名词后的从句里,用should + 动词原形,should可以省略.如 advice,decision,agreement,command,decree,demand,determination,indication,insistence,order,preference,proposal,request,requirement,stipulation etc.<br>It was Bill’s suggestion that everyone (should) have a map.<br>His suggestion was that everyone (should) have a map.<br>He gave us a suggestion that everyone (should) have a map.<br>3.在It is/was +形容词后的that 从句中用should的结构,should 可以省略.这类形容词常见的有:advisable,anxious,compulsory,crucial,desirable,eager,essential,fitting,imperative(绝对必要),impossible,improper,important,natural,necessary,obligatory,
鳜鱼害怕强光,喜欢在晚上活动,会游到浅水区猎食小鱼和小虾。垂钓时可以用活的鱼虾来作为诱饵,需要鱼在水里还能活跃的游动,这样可以更好的吸引鳜鱼上钩。　三农问答