Accent guide — Dravidian

English pronunciation for Tamil speakers

Tamil's native sound system doesn't distinguish voiced from voiceless stops the way English does (p vs b, t vs d, k vs g), and it has no native f, z, sh or the two th sounds at all — those five gaps do the most damage, ahead of anything else.
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What actually transfers

The specific sounds to check

p/b, t/d, k/g don't contrast natively

In native Tamil, the choice between p and b (or t/d, k/g) is decided by position in the word, not by meaning, so English pairs that rely on that contrast — like pin vs bin — can be genuinely hard to hear as different words at first.

f is a borrowed sound

f doesn't occur in native Tamil vocabulary, so it's often produced as a p, especially in careful or formal speech — fan can come out closer to pan.

th (both sounds) is genuinely new

Tamil has no equivalent of either English th sound, so both thin and this need to be learned as new articulations — tongue tip lightly between the teeth — rather than adapted from an existing Tamil sound.

z and sh are also borrowed

Like f, z and sh appear mainly in loanwords in Tamil, so they can be under-practised relative to English's frequent use of both.

Retroflex consonants transfer their place

Tamil has a rich set of retroflex consonants, and that tongue position can carry into English t, d, l and r, giving them a consistently different place of articulation from what a listener expects.

Vowel-initial epenthesis on consonant clusters

Word-initial consonant clusters (school, speak) can pick up an extra vowel at the front, similar to the pattern found across South Asian languages, since Tamil syllables don't usually start with two consonants together.

Vowel length is already precise — use it

Tamil marks long and short vowels carefully in its own writing system, which is an advantage: the short-i/long-e distinction in ship vs sheep maps onto a contrast Tamil speakers already track natively, once they know which English vowel is which.

A realistic plan

What a week looks like

Day 1-2

Drill p vs b and t vs d pairs, focusing on voicing (a buzz in the throat) rather than position in the word.

Day 3-4

Practise f, z and sh in isolation, then inside full sentences.

Day 5-6

Read a paragraph aloud, holding tongue-between-teeth for both th sounds.

Day 7

Re-read the diagnostic line and compare it against your Day 1 take.

Not every point above will be yours

These are common, well-documented transfer patterns for Tamil speakers as a group — not a rule about any one person. Region, schooling and how long someone has spoken English all change which of these actually apply. The diagnostic line is there to tell you which ones are really yours, not the list above on its own.
Questions

Straight answers

Why is p vs b specifically hard, when Tamil has both sounds?

Tamil has both sounds, but as automatic variants of one underlying consonant decided by where it sits in a word — not as a contrast that changes meaning. English uses that exact contrast to separate whole words, which is the new part.

Does Tamil's vowel-length system actually help with English vowels?

Yes, for the length-based pairs like ship/sheep — Tamil speakers already track long versus short vowels natively, so that specific contrast is often easier than it is for speakers of vowel-length-poor languages.