“他是否经常上学迟到”用英语说

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都是对的，
侧重点不一样
How
often
is
he
late
for
school----------侧重
“经常”这个词
Is[does]
she
often
late
for
school
----侧重“是否”
Is
he
often
late
for
school?does不可以。
How
often
is
he
late
for
school？是他多久迟到一次，是频率
How
often
is
he
late
for
school?
不是问“他是否经常上学迟到”，而是问他迟到的频率，比我可以答他三天就迟到一次等等。

Is she
often
late
for
school
?才是问“他是否经常上学迟到”。

两者的句意差别很大的。