- I can drive quite well --- Sé conducir bastante bien (ability)
- If you are tired, I can drive for a while --- Si estás cansada, yo puedo conducir un rato (possibility or offer)
The problem with CAN is that it has other characteristics:
- it's an auxiliary so you use it for interrogative and negative forms
- it's a defective verb so it has no infinitive or past participle forms; if you need these tenses, you must used the verb TO BE ABLE TO + infinitive:
- I've been able to drive since I was 20 --- Sé conducir desde los 20 años
- I've never been able to drive --- Nunca he podido conducir
- I'd like to be able to ride a bike --- Me encantaría saber montar en moto
Another important point of grammar is the use of -ING or -ED in adjectives. Remember we said it has a different meaning, sometimes the same as in Spanish:
- The book is interesting so I'm interested in it: El libro es interesante así que estoy interesada en el. The form -ING is active while the form -ED is passive; other grammars say that -ING is connected to things and situations while -ED deals with people's feelings.
If you want to practise with this or learn more, here you are some exercises with explanations about the topic: exercise 1 exercise 2 exercise 3