I can give you some pieces of advice about ESL teaching children with dysphasia.
First you need to understand their problems. Of course, all children are different, but in general dysphasia is characterized with slow and atypical development of oral understanding and expression. It means that in your classroom children with dysphasia could have problems with language comprehension, expression, metalinguistic skills, abstract thinking and generalizing. The best strategies to use with these students are:
1. Learning in action. It includes role playing, action songs, etc.
2. Opportunities to manipulate materials: project, crafts, cut and glue the part of the sentences in order to understand the structure etc.
3. A lot of repetition
4. Well organized routine of the classroom. Sometimes the minor changes frustrate them or make them feel lost.
5. Always assign the time for each task and remind the minutes left to help them to complete the task in time.
6. Using visual support. Flashcards, photos, pictures, charts, mind maps etc.
7. Be very patient.
Good luck in your teaching!