You Already Own the Hardest English Sound

Here's some good news: the 'th' sounds in words like 'think' and 'this' are famously hard for English learners worldwide, but Greek already has both of them natively — 'θ' as in the Greek letter theta, and 'δ' as in delta. Many learners spend real effort building these sounds from scratch, replacing them with s, z, t, d, or f — but you likely already produce them correctly without even thinking about it. The one thing worth double-checking is that you're using them in the exact same English words natives do, since English spelling doesn't always signal which 'th' is voiced (as in 'this') and which is voiceless (as in 'think'). Try this: read a short list of th-words aloud — think, this, three, that, mouth, mother — and notice which ones buzz (voiced) and which don't (voiceless), using a finger on your throat to check. Since your mouth already knows the shape, this is really just a labeling exercise. Enjoy having a head start on a sound that frustrates so many other learners!