He is not weak in Bangla but in English.

Parallelism(সমান্তরাল/সমান)

একটি বাক্যে কিছু conjunction (and, but, or, as well as, than, is, so --- as, as…..as, either --- or, neither- --- nor, not only but also etc.) দ্বারা যুক্ত হলে, conjunction গুলোর আগে ও পরে সমজাতীয় noun / pronoun / adjective/verb/adverb / infinitive, বসে এটি মুলত parallelism.

Type: 01 (and/as well as দিয়ে parallel)

Fahim is a scholar, an athlete and an artist.

Type: 02 (than/so---as দিয়ে parallel)

In an admission test, to answer correctly is more important than to finish quickly.

Type: 03 (Be verb/so-as/as--as দিয়ে parallel)

 Riding bicycle is similar to riding car. 

Type: 04 (more than দিয়ে parallel)

 Shela likes me more than him. 

Type: 05 (either--or/neither--nor/not only--but also দিয়ে   parallel)

Either you or he did the task. 

Type: 06 (or/but দিয়ে  parallel)

I usually go fishing or do something on Friday.