The bill must be paid immediately, or the electricity will be turned off.
Correct
The dress did not cost too much, but the quality it seemed excellent
Incorrect
The book was not long, but it difficult to read
Incorrect, no second verb
The material has been cut, and the pieces have been sewn together
Correct
After the plane circled the airport, it landed on the main runway.
Correct
The registration process took many hours since the line so long
Incorrect, no second verb
This type of medicine can be helpful, it can also have some bad side effects
Incorrect, no connector
we need to get a new car but is expensive
Incorrect, no second subject
The rain clouds can bee seen in the distance, but no has fallen
Incorrect, missing subject
I'd love to stay ___ I have to catch my bus.
but
His hot chocolate was too hot ___ he put some cold milk in it.
so
They were hungry ___ they made some sandwiches.
so
We can go to the pool ___ we can go horse-riding, whichever you prefer.
or
She is very popular, _________she is not always happy
yet
