For practising the “th” sound:
The thirty three thieves thought they thrilled the throne throughout Thursday.
The Japanese have a major issue with “r” and “l” because they just don't have anything like them in their own language, and so struggle to hear the difference. Try:
Red lorry - yellow lorry - red lorry - yellow lorry.
If you have problems producing “sh” and it often is pronounced as just “s”. A perfect tongue twister is:
She sells sea shells on the sea shore.
For practicing the “ch” sound:
Chip shops stock chips.
How much wood would a woodchuck chuck if a woodchuck could chuck wood?
Other useful tongue twisters:
Peter Piper picked a peck of pickled peppers. A peck of pickled peppers Peter Piper picked.
Betty and Bob brought back blue balloons for the big bazaar.
When using this tongue twister try to make sure you pronounce each word correctly and learn the difference between the different words, this will also help with your listening skills:
Mr See owned a saw. Mr Soar owned a see-saw. See's saw sawed Soar's see-saw before Soar saw See.