“You could say that again (and then some)”
A technique known as “Echo-expansion modeling” involves repeating what your child says and then adding to it.
YOUR CHILD YOU SAY
“Mommy” à “Mommy’s home”
“Up” à “Up please”
“Mommy go” à “Mommy’s going to work”
“We play car” à ”We play with car together”
Do not correct your child for not using an incomplete sentence, rather expand on it and encourage him to do so. Modeling instead of correcting is the most effective way to teach your child about language.