English With Jennifer
This YouTube channel is a great place to go for any English language learner. Many of her lessons are free to view (there is a paid membership area where there are additional videos).
Lessons start from basic English language topics like: Greetings, useful expressions and basic grammar. There is lots to choose from and each video lasts between 3 and 15 minutes. Something you can share and watch in a tutoring session or ask your learner to review for homework.