Uma dica para quem é aluno do livro 3 (GS3 ou PEC3).
Como adicionar o ED aos verbos regulares.

Regular Verbs

 

1. when the verb finishes in E we add D -> loveD 

Example
infinite	Simple  past	infinite	Simple  past	infinite	Simple  past
to escape	escaped	to walk	walked	to stay	stayed

2.  finishes in Y

 

Attention to verbs ended in Y

P	L	A	Y
	Cons.	Vowel
P L A Y ED

S	T	U	D	Y
		Vowel	Cons.
S T U D IED

3. one syllable, and finishes in a sandwich (consonant-vowel-consonant) we double the last  consonant and add ED

stop (T - consonant / O - vowel / P - consonant)    ->   stoPPED

4. more than one syllable but is oxitone and finishes in a sandwich (consonant-vowel-consonant ) we double the last  consonant and add ED

admit -> admiTTED