躺：lie lay lain lying
                  放置，下蛋：lay laid laid laying
2．逻辑关系：
1）列举/种属关系：
such…as;  especially;  in particular;  specifically;  for example;  for instance;  likely;
2）因果关系：
because (for);  due to;   owing to;  thanks to;  since;  for;  as;  for the reason that;  seeing that;
3）并列/递进：
besides;  likewise;  moreover;  also;  too;  what’s more; apart from;  except;  furthermore;
not noly…but also….;  in addition;
4）转折/让步关系：
however;  but;  never the less;  nonetheless;  whereas;  still;  though;  although;  anyhow;  anyway;  in any case;  yet;
5）对比关系：
by contrast;  in contrast;  by comparison;  like;  as…as;  on the contrary;  conversely; oppositely;  ….than….;
逻辑关系举例1：Test 4
Sometimes homework is returned    76    brief written comments but without a grade.
76. A) by        B) in        C) for        D) with
逻辑关系举例2：Test 2
The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. __71__ these wide modern roads are generally __72__ and well maintained, with __73__ sharp curves and many straight __74__, a direct route is not always the most _ 75__ one.