Lack of subject. The use of GSM-Mar, and much more. Thailand people don't have confidence in speaking English, the vast majority of people in Thailand speak English and will require heavy training.
The accent Using grammar and Thailand many people do not have the confidence to speak English. Thailand, the majority of people do not speak English. And will require intensive training.
The accent, the use of the grammar, and many people don't have much confidence in speaking English. Why people can't speak English. And must have trained hard.