Mother's Day is coming.i_______(buy)some flowers to my mom.

Mother's Day is coming.i_______(buy)some flowers to my mom.
Mother's Day is coming.i_______(buy)some flowers to my mom.

Mother's Day is coming.i_______(buy)some flowers to my mom.
应为：Mother's Day is coming.母亲节快到了.
I bought some flowers for mom.我为妈妈买了些花.介词应为for

I am going to by some flowers to my mom.

will buy
is coming是现在进行时 表将来

will buy 一般将来时