This unit is part of a six-part phonics course. Unit 4 focuses on two consonant blends, final blends, twin endings, trigraphs, digraphs and plural sounds.Breakdown of the units:Unit 1 - The Alphabet.Unit 2 - Blending letters.Unit 3 - Short vowels.Unit 4 - Blends, digraphs and plural sounds.Unit 5 - Long vowels.Unit 6 - Special sounds.