Remember: strong verbs only have a

Everything else (verb endings)

ich

du

er / sie / es

wir

ihr

Sie / sie

Note: There is a slight difference in the "du" form

vowel change in the du and er/sie/es forms

stays the same as weak verbs.

lese

liest

liest

lesen

lest

lesen

where an "s" from the stem is dropped to avoid a double "s"