24. Copy the words. Circle a letter or letters giving the sound [f]. Underline the two words which don’t contain this sound.

Words with [f]: fireplace (f), phone (ph), first (f), enough (f), Africa (f), photographer (ph), giraffe (f), off (f), laugh (f), phrase (ph), tough (f), performance (f), scientific (f), telegraph (ph), soft (f), fantastic (f). Words without [f]: physics, though.