Collocations with do, make, have, and take. This is a very simple app that works offline and takes very little space on your device.
It is meant for English language learners who would like to learn, practice and test themselves on when to use the verb "do" and the verb "make", which happens to be very confusing for non-native speakers of English.
I and my students have been using it for a while and it has helped them master this tricky aspect of English, which is very common in international English language tests.
Try it and you will not be disappointed.