Question

宾语从句的主句如果不是一般现在时 过去时 从句应该用什么时态?例如主句是现在完成时从句用什么时态？谢谢

Answer 1

简单举四个例子
I
know
you
are
right.
I
knew
you
were
right.
I
have
known
you
are
right.
I
had
known
you
were
right.
补：讲一个大多数同学忽略的事实，现在完成时属于现在时，过去完成时属于过去时，还是举例子I
couldn't
remember
where
I
--A----yesteday.A,went
B
have
gone
明白前面所讲现在完成时属于现在时的同学肯定不会问为什么不选B了。

Answer 2

宾语从句的时态是这样规定的：
主句为过去式，从句需用过去时的某种形式，如一般过去时，过去进行时，过去将来时等（真理、客观事实除外）；主句为现在时，从句可根据需要用所需时态。
we
all
know
that
he
has
studied
english
since
1998.
we
believed
that
he
had
earned
enough
money
to
build
a
house.
the
teacher
told
us
that
the
sun
rises
in
the
east.