What is the difference in the meaning of following sentences (I'm asking for detailed anlaysis of these sentences)
If it rains, I will stay at home.
If it should rain, I will stay at home.
If it should happen to rain, I will stay at home
If it happens to rain, I will stay at home.
Can I say 'there is no difference in the meaning among 2 ,3 and 4 sentences ? There is no difference in the meaning and usage among 'should', 'happen to' or should happen to' together. Do they all mean 'by chance' ?
Again , i would like to know if the following sentences are grammatically correct or not:
1.If she should happen to read the newspaper, she would see your article.
2.If they should agree to come ,we would be delighted.
Source :perfect English grammar.com in Advanced conditionals Explained (pdf )