(可能不太对，仅供参考)

Long time no see

Not learning English for a long time. 
好久没学英语了， (I haven't learned English for a long time / for a period of time.)
No English reading，No speaking，No memorizing words
没有读英语，没有说，没有背单词

I quickly forgotten  
我快要忘记了 (I've almost forgotten.)

I want to say I'm come back
我想说我回来了 (I'd like to say I am back.)

However busy work,I also want to find time to study everyday
无论工作多忙，每天也要抽一点时间去学习 (No matter how busy we are with our works, we shall squeeze our time to learn it.)

I will do my best
我会努力的