As is often the case with elderly people, grandpa talked about my new hair style for at least 50 minutes.

就像老年人经常做的那样，爷爷至少花了50分钟谈论我的新发型。

As is often the case with human beings, many animals sleep a lot when young, but sleep much less when they get older.

和人类一样，许多动物年幼时睡得多，但长大后睡少了很多。

She is late, as is often the case.

她迟到了，这是经常的事。

He is absent, as is often the case.

他缺席了，他经常这样。

He was absent, as is often the case.

他缺席了，这是常有的事。