If next Saturday will be warm and sunny, I will go to the beach.
If sentences are interesting. First, they help us express a future possibility – If next Saturday is warm and sunny. Although we have weather forecasts on the internet or the evening TV news, we cannot know if they are correct until Saturday arrives. That is why we use the word if. Being optimistic people, we first imagine a Saturday with a blue sky and a smiling sun, then say what our plans are for that day – I will go to the beach.
Here is the complete sentence:
If next Saturday is warm and sunny, I will go to the beach.
If next Saturday is warm and sunny talks about the future. Notice how we use a present tense and not
will. This is important to remember because too many learners of English instinctively say or write If next Saturday will be warm and sunny.
The second part of the sentence – I will go to the beach – is where we talk about the result of a warm and sunny Saturday. This is when will is used. Here are a few more examples:
If you catch Covid-19, you will have to stay in quarantine for 2 weeks.
If the team loses the next match, they will not become champions.
If our friends do not arrive by 8pm, we will leave without them.
There are other types of if sentences, all with their own special structures. However, do not forget that when you see an
if + will or a will in both parts of the sentence, then that sentence is grammatically wrong.