TH as /t/

[ahmadhandasa]

Hello everyone,
I just don't know When we do pronounce TH sound as /t/ as in ( Thomas ,Thompson, Thompstone, Thomson, Thun, Thuron, Lesotho, Thames, Thai, and thyme ) !
Hope i could find my answer here !
Thanks in advance
Ahmad,
Arab Republic Of Egypt ..:)

[Raymott]

Hello everyone,
I just don't know When we do pronounce TH sound as /t/ as in ( Thomas ,Thompson, Thompstone, Thomson, Thun, Thuron, Lesotho, Thames, Thai, and thyme ) !
Hope i could find my answer here !
Thanks in advance
Ahmad,
Arab Republic Of Egypt ..:)

Anything with Thom is /t/. But even natives would have problems with this. For example, I would not be sure about Thuron and Lesotho (though I could at least check Wikipedia for Lesotho, Thailand and Thames).
In some cases, eg. a woman called Thea, it could go either way - it's personal, as many of those names would be.

[raindoctor]

Unless you are a broadcaster or work in theater, where the correct pronunciation (listed in dictionaries) is demanded, I don't worry much about this question at all. If you were born in Britain, you would know the pronunciation of Thames as /tɛmz/. I used to live on Mathilda Ave, so I knew its local/correct pronunciation.

Check Carney's book on spelling:

A Survey of English Spelling - Edward Carney - Google Books