There are some very notable differences between written and spoken English. Spoken English, as a language is quite relaxed. This means that in many occasions people speak and their English grammar is not quite correct. Often people will say things like, ‘If I was a boy’ which does not sound too grammatically incorrect, but in written form it looks slightly odd. The reason is that ‘if’ is already a ‘wishing word’ and, as such, needs the subjunctive tense to be used. So the proper written form of this sentence is, ‘If I were a boy’. It is also notable that when one is writing, he/she tends to use words that would not normally be used when speaking about the same subject.
It is thus easy when speaking English to get away with not having very good grammar, but this will show up when the same words are written down. If one is learning English, it is important to try to make sure that grammar is checked. You should make sure that when you are speaking English you pay attention to grammar and grammatical issues. When writing in English, ensure that you always check your grammar, either using an online grammar checking package, or just by going through it. But the grammar checker is much more reliable.
Trying to speak English as it is written helps you make sure that you don’t allow your standard of grammar to slip. In spoken language, everything we talk will give some meaning and the listener is not particular about the grammatical correctness of the language. He/she is interested only to get the subject but when it comes to written English, everybody will keenly observe all these things and a small mistake, becomes a big issue. In my opinion, people who write good English will definitely increase their spoken English skills.