Question

那些动词不定式后面的TO要省略~!

Answer 1

动词不定式省略to的情况：
（1）不定式在感观动词（see,
notice,
look
at,
listen
to,
hear,
watch,
feel,
observe）、使役动词（let,
make,
have）后作宾语补足语时，通常省去to。如：
I
have
my
students
come
early.
（2）不定式在help后作宾补时，可带to，也可省略to。如：
I
helped
him（to）find
his
lost
watch.
注意：以上两种情况变成被动语态时要加上to。如：
She
was
seen
to
go
into
the
classroom.
（3）如果两个或多个不定式并列使用时，常在第一个不定式前面加to，后面一般都省略。如：
To
try
and
fail
is
better
than
not
to
try
at
all.
6.
“疑问词＋不定式”组成的不定式短语在句中可以作主语、宾语和表语。如：
She
told
me
when
to
start.