問英文生子數個

其實呢兩句句子可以有可以冇。
He seems to be happy = He seems happy
在這句句子裏，可以有 to be，可以冇 to be。
He seems to be happy → 佢睇黎好似好開心
He seems happy → 佢好似好開心
只不過是少了些詞語(譯中文時)，但其實有冇都能表達意思的。
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You "had better" do your homework.
其實 had better 係一個常用的詞語，不能改做其它的。
had better 解作「最好」(would be wise to)
我地係作句子常常將 had better 簡化做 'd better。
You'd better do your homework.
所以並不能用 has 代替的。