Can you be Able to Help Me?

I can able to come to the meeting tomorrow?
I could able to complete the job in time!

Have you heard this often enough and wondered, groaned or even asked yourself why it sounds so strange?
It sounds strange because it is just not right!
Can is a modal ( a grammatical terminology) and like all modals changes the mood of the verb. Can by itself means to be able/ability to as in:

I can speak good English.
I can drive a car.
I could speak fluent Japanese by the time I was ten years old!

So, why add be able to in addition to can?
So, our corrected sentences are:

I can come to the meeting tomorrow.
If you want to use the word able, then say
I will be able to come to the meeting tomorrow.
I could complete my job in time!

So, the next time you are tempted to use can and be able together, just put on the brakes!