ability and possibility in English

hii all of you hope that you are ok 

today we are going to deal with ability and possibility in English language 


''ability is something that can't be done easily and by everybody it is expressed by the form ''able to 

the grammatical construction is 

S+ V TO BE + able to + v stem + rest of sentence

for instance:  i'am able to speak three languages 

he is able to claim mountains 



possibility is something that can be done easily and by everybody 

it is expressed by the form can /could 

the grammatical construction is :

S+ CAN OR COULD + V STEM + REST OF SENTECE 

for instance :

i can go to school by bus 

he could visit his grand parents last summer 

as a conclusion we can say 

able to refers to  ability

can or could refers to  possibility 

good luck for all of you 

salam