I have studied at a community college for 4 semesters, but my English ability is still very poor.
#I have studied at a community college for 4 semesters, but my English ability is still very poor.
#I have studied at a community college for 4 semesters, but my English ability is still very poor.
#I have studied at a community college for 4 semesters, but my English ability is still very poor.