If you are not sure that your sentence is complete try this simple sentence fragment test.
Answer these three simple questions:
If your sentence answers yes to all three questions then it is a good sentence. If it answers no to any of the questions then it is a sentence fragment, and you will need to change it.
Sentences without a subject.
Closed the door and left.
He closed the door and left.
(subject/he)Was running down the road.
The dog was running down the road.
Sentences without a verb.
That time of wonder and amazement.
That was a time of wonder and amazement.
(verb/was)Clothes and toys scattered around the room.
Clothes and toys were scattered around the room.
Sentences that doesn’t make sense.
I hate cutting the grass. Which is a problem because I have a big garden.
(independent clause/first sentence – dependent clause/second sentence/doesn’t make sense)
I hate cutting the grass, which is a problem because I have a big garden.
(dependent clause/second sentence needs to connect with an independent clause/first sentence)She is busy tonight. Doing her English homework.
She is busy tonight, doing her English homework.