sentence: In addition , my major is English , so teachers teach and explain in English , and I could n't keep up with lessons well at first .
modified: In addition , my major is English so teachers will teach and explain by English , which I ca n't catch up on lessons well in the first time .
transformation: PUNCT, VERB:TENSE, PREP, OTHER, VERB:TENSE, VERB, PREP, PREP, DET, NOUN