-th is one of the difficult sounds in English if you don’t have it in your language. What makes it worse is that there are two ways to say it: the hard way and the soft way. There are also some words when -th sounds like -t, when the -h is silent. (We English like to catch you out…) These sentences will give you some practice.
A) Thorley Thynne in his thong threw the thing at the throng in the bath.
B) There were both their mother and father, and with them, three feet further on, was Cathy Thorn, the thieving therapist.
C) For the sixth time, Thaddeus Rother thought this was the way north, but the path stretched south through thick and thin.
D) On Thursday, Timothy thanked the thatcher, then breathed in the scent from the bath as he stroked his throat with his thumb.
E) There is no thyme by the Thames, thought Ethel Thompson from Thailand.
F) Athelstan Smith thinks that other bathers ought to bother with the bothy.
G) As the thermostat proved his theory, Winthrop Thingwall watched the weather from the smithy and wondered whether he heard thunder.
H) Will Gwyneth Thackeray ever thaw in the theatre? Wordsworth thought it might be worth the bother. Unless Gwyneth had thrush, that is.
I) Macbeth got a thrill when he thought he should have the thistle throne rather than be a thane.
J) Beth Rathbone thought that there were thirty-three things that she ought to throw at them as she thrust the throttle through thoroughly, with a thud.
K) Thrashing a thousand thimbles was not thriving a thousand-fold for Thorndyke Threadgill, but the throb threatened his thirst for a thesaurus.
Would you please leave me a -th sentence of your own?