如果没有你说的这些词,那么就要借助于每种时态中的助动词来帮助提问,即把助动词提前,你说的例句是一般过去时,一般过去时的时态助词是did,所以,这个句子的一般疑问句就是:
Did
they
go
to
the
beach
on
vacation?
假若是they
have
gone
to
the
beach
...,?那么变为:Have
they
gone
to
thee
beach...?
再比如:I
had
learned
Enlgish
for
five
years
before
i
came
here.
变为:Had
you
learned
English
for
five
years
before
you
came
here?