should + -'ve
should've
should have 只在後面接過去分詞時可以縮寫為 should've，如 You should've gone.（你早該走了。）若 have 不是助動詞，而是普通的動詞，則 should have 二字不能縮寫，即 *You should've some patience. 是不合法的句子。參見 gonna。
