"Th" is not an actual combination of "t" and "h," such that you can still hear the individual letters in it. It is more of a single sound, that is designated as "th," for lack of anything better, and also to avoid adding another letter to the 26 letters already in the English alphabet. As for the practical pronunciation of it, you might try saying "tink": in this word, which is easy to pronounce, the tip of the tongue contacts the back of the upper teeth for a very brief time only, and then immediately breaks contact with the teeth.
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AnonymousIn the pronunciation of 'th' diagraph in the word 'think', do you hear the sounds for both t and h as in a consonant blend please?Not at all. It is one sound represented by two letters (two 'graphs'). It is not a consonant blend.