Question

write two present principales in which the last letters are doubled ​

Answer 1

We add -ing to a verb to form its present participle, and -ed to regular verbs to form the past simple. When doing this, we sometimes double the last letter of the verb, as in these examples:

stop ⇒ stopped, stopping

stoped

stoping

refer ⇒ referred, referring

refered

refering

Sometimes, however, we don’t double the last letter, as with the verb visit:

visit ⇒ visited, visiting

visitted

visitting

To understand this spelling rule, it’s first necessary to know the meaning of vowel and consonant:

vowels = a e i o u

consonants are all other letters (b c d f g, etc).