陷阱4not to mention 更不用说，此外还有not to say 虽不能说，即使不能说Sb.is likely to do sth.It is likely that-It is possible(for sb.)to do sthIt is possible that-learn to do sth=learn how to do sthexplain how to do sthexplain to do sth修饰比较级或副词too(太)时，只能用rather或much，而不用quite
