my older sister has studied Physics since eight months.这句话错在哪里?

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myoldersisterhasstudiedPhysicssinceeightmonths.这句话错在哪里?myoldersisterhasstudiedPhysicssinceeightmonth

my older sister has studied Physics since eight months.这句话错在哪里?
my older sister has studied Physics since eight months.这句话错在哪里?

my older sister has studied Physics since eight months.这句话错在哪里?
since应该改成for
意思是我姐姐学习物理八个月了.

since eight months ago

for eight months

since后的时间状语时点时间所以在与完成时态连用时我们用since+短时间+ago. 本句改为my older sister has studied Physics sice eight months ago