i have devoted lots of time for stdudying it.这句话,这样说正确吗for stdudying it还是for study it?

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i have devoted lots of time for stdudying it.这句话,这样说正确吗for stdudying it还是for study it?

i have devoted lots of time for stdudying it.这句话,这样说正确吗for stdudying it还是for study it?
i have devoted lots of time for stdudying it.这句话,这样说正确吗
for stdudying it还是for study it?

i have devoted lots of time for stdudying it.这句话,这样说正确吗for stdudying it还是for study it?
for stdudying it
因为for是介词,后面的动词要加-ing

for stdudying it
for是一介词,后就跟动名词作宾语

"for studying it" is right
the latter one is wrong
and you can also us" for learning it"

for stdudying it
for是一介词,后跟动名词(-ving)作宾语