six

I take a class.

私は授業を受けます

I take a class in the lecture room.

私は講義室で授業を受けます

I take a class in the lecture room on the sixth floor.

私は6階の講義室で授業を受けます

I take a class in the lecture room on the sixth floor every Saturday.

私は毎週土曜日に6階の講義室で授業を受けます

I take a class in the lecture room on the sixth floor every Saturday with my friend.

私は友達と毎週土曜日に6階の講義室で授業を受けます