General Characteristics:

front vowel: the tip of the tongue is resting against the lower teeth and it is the arch in front of the tongue that determines the vowels' sounds.

Words to practice:

• kit
• bid
• hymn
• minute
• hit
• lip
• sick
• will

Short and Long Vowel Oppositions /i:/ - /ɪ/:

• sheep – ship
• leak – lick 
• cheek – chick  
• peel – pill
• bean – bin  
• heat - hit
• leap - lip
• seek - sick
• wheel - will
• neat - knit
• feet - fit
• feel - fill
• reap - rip
• these - this
• cheap - chip
• eat -it
• meal - mill
• seat - sit
• peel - pill

Tongue Twisters:

• Pretty little Ms Smith lives in this vicinity
  
• Is this the same thing as that?
• This thin tin thing is thinner than that thin tin thing
• is this (3), this is (3)
• We visited the village on Wednesday
• A big black bug bit a big black dog on his big black nose

Phrases:

• Jill's physical condition will influence an impending accident.
• Bill introduced a combination of video images and still pictures.
• My little sister is persistent in interfering in my business.
• His inability to sit still compromised his willingness to finish the project.
• We think Tim should reconsider the situation and admit to his guilt.
• The authorities sought the violence to convict the convict in the vicious assault.
• In the middle of the disaster, the thought of a tranquil dip in the Pacific was calming.
• It is silly to begin dinner when Phil is still missing.
• Chris resisted building in a traditional and unimaginative architectural style.
• I initially take aspirin when I practice my English.
• The menu consists mainly of squid and is quite limited.
• I wish the script had been less typical and better written.
• In my opinion, physical activity is important.
• She rapidly fingered the guitar strings, producing beautiful music.
• The office had a pocily of nondiscrimination for women.
• It was a disaster when the drink spilled all over the clinical evidence. 

More words to practice the target sound here