1. Sometimes formal English and informal English are undistinguished.

2. Sometimes formal English and informal English must be carefully distinguished.

3. How to differentiate formal from informal English?

4. Do you teach formal or informal English?

4. Sentencedict.com is a sentence dictionary, on which you can find nice sentences for a large number of words.

5. You speak in informal English.

6. Understand the difference between formal and informal English.

7. Key :I really like informal english, it's more casual than formal english.

8. Ken:I really like informal english, it's more casual than formal english.

9. I really like informal english, it's more casual than formal english.

10. Ken: I really like informal English, it's more casual than formal English.

11. English is widely used nowadays. And it can also be divided into formal and informal English.

12. The omission of prepositions is a common practice in informal English or spoken English.

13. "Hitched" usually means "married". Sometimes it means in a very serious relationship (as good as being married). It is very informal English.

14. Phrasal verbs are very common and are a really good way to make yourself sound more natural when speaking informal English.

15. The subject deletion in tag-question is a common phenomenon in informal English.

16. The proportional quantification by comparative structures is commonly used in informal English, but some of structures are used in science and technology English with high proportions.

17. Statistics show that they occur frequently, in both formal and informal English speech and writing.