Common English mistakes Thai speakers make

Thai marks time and number with separate words rather than by changing the word itself, and Thai syllables can end in only a few sounds. Those two facts explain most of the patterns that repeat in Thai speakers' English.

Verbs and nouns that do not change ("Yesterday I go", "two book")

In Thai a time word shows when something happened, and a number word shows how many. The verb and the noun stay the same. In English that becomes "Yesterday I go to work" or "I have two book".

Fix: English also changes the word itself: "Yesterday I went", "two books". Practise pairing every time word with its verb form, and every number with a plural noun, out loud.

Dropped or changed final consonants

Thai words end in a small set of sounds, so English final sounds often disappear or change: "milk" can sound like "mik", "bus" like "bu", "test" like "tet". This also removes the endings that carry grammar, such as the "-s" on plurals and the "-ed" on past verbs.

Fix: drill the last sound of each word on purpose, slowly at first. Final sounds are a spoken habit, so listening and repeating works better than reading.

Sounds English has and Thai does not: th, v, sh, z

"Think" often comes out as "sink" or "tink", "very" as "wery", and "she" as "see". These sounds do not exist in Thai, so the ear hears the nearest Thai sound.

Fix: a tutor can show the mouth position for each one. For "th", the tongue tip comes slightly between the teeth. For "v", the top teeth touch the bottom lip. Minimal pairs (think, sink, fink) make the difference audible.

Missing "a" and "the"

Thai has no articles, so "I bought car" or "She is teacher" feels complete. English needs "a" or "the" before most singular nouns.

Fix: learn it as a pair, the noun and its article together: "a car", "the teacher".

Common questions

Why do these mistakes continue after years of studying English?

Thai has no tense endings, plural endings or articles, so there is no instinct to build the English habit on. A rule can be known perfectly on paper and still not appear in fast speech. That gap closes with spoken repetition, not more grammar study.

What should I ask a tutor to focus on?

Ask for correction on final consonants, past and plural endings, and the th, v and sh sounds in live conversation. Ask the tutor to repeat your mistake back to you so you can hear it.