Question

英语中的时态及用法。有例句有翻译。

Answer 1

1、宾语从句在复合句中作宾语。引导宾语从句的连词that一般可省略。
e.g.
i
hope
(that)
everything
is
all
right.
2、介词之后的宾语从句，不可用which或if连接，要分别用what或
whether。
e.g.
i'm
interested
in
whether
you've
finished
the
work..
i'm
interested
in
what
you've
said.
3、whether与if都可以引导宾语从句，常可互换。但下面情况不能互换。
①宾语从句是否定句时，只用if，不用whether。
e.g.
i
wonder
if
it
doesn't
rain.
②用if
会引起误解，就要用whether。
e.g.
please
let
me
know
whether
you
want
to
go.（此句如果把whether改成if，容易当成条件句理解）
③宾语从句中的whether
与or
not直接连用，就不能换成if；不直接连用，可换。
e.g.
i
don't
know
whether
or
not
the
report
is
true.
i
don't
know
whe旦常测端爻得诧全超户ther/
if
the
report
is
true
or
not.
④介词后的宾语从句要用whether引导。whether
可与不定式连用。whether也可引导主语从句、表语从句、同位语从句，还可引导让步状语从句，以上均不能换成if。但引导条件从句时，只能用if，而不能用whether。
e.g.
it
depends
on
whether
we
have
enough
time.
they
don't
know
whether
to
go
there.
please
come
to
see
me
if
you
have
time.