You can cut the cards out and laminate them.
This is great to use as a whole group activity. Pass a card out to each student and have them read it to themselves. Have the students move to one side of the room if they believe their card is a declarative/complete sentence and to the opposite side if it isn’t.
Once students get to the side of the room they believe they belong on, have the students partner up and read their card each other their cards in order to see if their partner agrees with their decision.
After a couple minutes of students discussing answers, teacher can walk around and confirm answers with students.
Students can also use this in a center and simply sort the cards by "Sentence" and "Not a Sentence".
60 sentence cards
Sorting Headers: "Sentence" and "Not a Sentence"