Seven of August

A typhoon is aproaching at my area.
It was wired  weird weather.
I went to a dance lesson after work.
I go  have been going to dance lesson class every Monday for 5 years.
The teacher's skill is very great high.
I like his choreography.
It's emotional and cool.
The music that he uses in his class is very good.
But the number of students is gradually decreasing.
Maybe  I think maybe because the population of young people is decreasing in Japan.
There were only two students were two people including me.
But it  was very fun.
I do like his class.
I talked to him a  little bit after his lesson.
I had a good time.

Seven of August

A typhoon is approaching at my area.
It was wired weather. (I am not sure what you mean by this?)
I went to a dance lesson after work.
I have been taking dance lessons every Monday for the past 5 years. (This is a way to say it if you are still taking dance lessons.) 
The teacher's skills is are very great.
I like his choreography.
It's emotional and cool.
The music that he uses in his class is very good.
But the number of students is gradually decreasing.
Maybe I think the reason is that the population of young people is decreasing in Japan.
The students were two people includ me. (A better way to say this would be: There were only two students attending class, including me.)
But I was very fun. (I had a lot of fun. - OR - It was plenty of fun.)
I do like his class.
I talked to him a little bit after his (you can use the or our instead of his) lesson.
I had a good time.

Good job, Masanao-san! Please let me know if I can clarify anything or help you in any way!