BE ABLE TO

BE ABLE TO

The BE ABLE TO meaning is similar to CAN and - as indicated above - used in tenses that CAN can not be reconciled.

BE ABLE TO IS USED:

SIMPLE PRESENT 
I can read in Inglés = I am able to read in Inglés
I can read (I can read) English.

SIMPLE PAST 
I Could read in Inglés = I was able to read in Inglés
He could read (I could read) English.

However, for the remaining tenses have to use BE ABLE TO CAN replacing. BE ABLE TO not being a modal auxiliary, can be used without limitations in all tenses.

SIMPLE FUTURE 
I will be able to read in English.
  I can read in English will is wrong.
I can read (I'll know read) English.

SIMPLE CONDITIONAL 
I would be able to read in English
  I would can read in English is wrong.
You could read (I would know read) English.

PRESENT PERFECT 
I have been able to read in English
  I have can read in English is wrong.
I have read (I have heard read) English.