It was cold outside. We stayed inside.
It was cold outside, so we stayed inside.
I went to the store. It was closed.
I went to the store, but it was closed.
I went to the store. I bought a banana.
I went to the store and bought a banana./I went to the store, and I bought a banana.
She did not sleep last night. She was tired this morning.
She did not sleep last night, so she was tired this morning.
She looked in her bag. She didn't find her pen.
She looked in her bag but didn't find her pen.
I bought pizza. I bought a hot dog.
I bought pizza and a hot dog.
Tomorrow might be cloudy. It might be sunny.
Tomorrow might be cloudy, or it might be sunny.
You can take the bus. You can walk with me.
You can take the bus or walk with me./You can take the bus, or you can walk with me.