One of the best ways to improve your English pronunciation is TONGUE TWISTERS. At first it might seem challenging but the more you do them, the easier they get. So.
Thelma's thick thistles need therapy. The thoughtful mouse's mouth is something else. The sickening thickening soup was thoroughly soppy. Sam's third thalamus is thoughtful. It's easy to stick it to.
These sounds tend to be tough for Arabic speakers, as there is no "p" sound in that language, at least that's what I have been told by my students. Please.
These are two of the easiest sounds to mix up in English, so practice with this fun tongue twister until you can say it 3 times fast!