Modal verbs are easy to spot because there are so few of them. In addition to must, shall, will, should, would, can, could, may and might, we can add ought to and have to. If we are told that we ...
For regular verbs ending in 'ar' we take away the 'ar' and add a new ending. Take hablar, which means 'to speak'. If we want to say 'I speak' the ‘ar’ is removed and an ‘o’ is added - hablo.