Diary 30 Jan.

The bus I usually take at 8:22am didn't come this morning.
This bus does not come frequently, so I need to check and follow the timetable.
Sometimes, this bus doesn't come on time or doesn't even come at all.
When I arrived at the stop at 8:17am, I saw the bus had already gone. How come the bus didn't come on time?
I was late to my class because of missing this bus. I really hate this bus.

Nice job!

Diary 30 Jan.

The bus I usually take at 8:22 didn't come this morning.
This bus is not frequent, so I need to check and follow the timetable.
Sometimes, this bus is not coming on time even doesn't come.
When I arrived at the stop at 8:17, I saw the bus had gone. How come the bus didn't leave on time?
I was late to my class because of missing this bus. I really hate this bus.

'Sometimes, this bus is not coming on time even doesn't come.' :

Sometimes this bus does not come on time or (even) doesn't come at all.

/ Sometimes this bus does not come on time or at all.

'I saw the bus had gone' :  I saw that* the bus had gone  *['that' is often omitted and doesn't really matter]