Misunderstand Structure.
The most Thai students is cannot understand and misunderstand structure, including to have problem remembering. The structures are of tense categorized into active voice, Passive voice. We can divide the time of speak 3 types Past , Present , Future and categorized into 4 types simple, continuous , perfect and continuous. Different to Thai language that exchange verb , In English verb tell the meaning of the moment for example : I eat rice, I eating rice , I have eaten rice or I have been eating rice. Confusing to use tense correctly because structure of Thai language and English language are different, including to not use tense in everyday life,