till和until一般情况下两者可以互换,但是在强调句型中多用until。并且要注意的是:如果主句中的谓语动词是瞬时动词时,必须用否定形式;如果主句中的谓语动词是延续性动词时,用肯定或否定形式都可以,但表达的意思不同。例如:
I
didn't
go
to
bed
until(till)
my
father
came
back.直到我父亲回来我才上床睡觉。
It
was
not
until
the
meeting
was
over
that
he
began
to
teach
me
English.直到散会之后他才开始教我英语。
I
worked
until
he
came
back.我工作到他回来为止。
I
didn't
work
until
he
came
back.他回来我这才开始工作。
Please
wait
until
I
arrived.在我到达之前请等我。