It won't rain tomorrow and I'll go to the coast. Use UNLESS.
We’ll go to the coast tomorrow unless it rains.
Your friend might need some help. If so, tell her to give you a call.
If you need some/any help, give me a call.
I'm not rich or I'd have given up working long ago.
If I was/were rich, I'd/ would have given up working long ago.
You may want a chat, so just call me.
If you want a chat, just call me.
The automatic result of the door opening is the fan coming on.
If the door opens, the fan comes on.
You go away and I'll miss you.
If you go away, I'll miss you.
You haven't got a pen, so you can't write down the address.
If I had a pen, I could write down the address.
Throw a stone into water and it sinks.
If you throw a stone into water, it sinks.
Warn your friend not to put too many tins into the plastic bag or it'll break.
If you put too many tins into the plastic bag, it'll break.
Critizise your friend. She should start preparing her projects earlier. She will probably be so far behind now.
If you started preparing your projects earlier, you wouldn't be so far behind now.
You don't know Jason and you don't invite him to your parties.
If I knew Jason, I would invite him to my parties.
He's very ill so he isn't at work. Use UNLESS
Unless he was very ill, he would be at work.
We're lost because we never look at the map.
We wouldn't be lost if we looked at the map.
I haven't got a key, so I can't get in.
If I had a key, I could get in.
You will talk about football and I'm sure I will to be very bored.
If you talk about football, I'm sure I will be very bored.
You think Emma should book a seat on the train. Otherwise, she has to stand.
If Emma doesn't book a seat on the train, she'll have to stand.
The baby doesn't cry at night, so we have a good sleep.
If the baby cried at night, we wouldn't have a good sleep.
I'm afraid of spiders or I'd have picked it up. Use UNLESS
Unless I was/were afraid of spiders, I would have picked it up.
Nigel hasn't got satellite TV, so he can't watch the game.
If Nigel had satellite TV, he could watch/would be able to watch the game.