Present simple, past simple or present perfect
Which tense is usually best for each of the following situations? Drag each situation into the present simple, past simple or present perfect box. E.g. if you think a theory is best expressed in the present perfect, drag it into the present perfect box. Then click 'submit' to see if your answers are correct and read why each sentence sounds better in the present simple, past simple or present perfect.
If you are not using a computer mouse then to use buttons to move the sentences from one column to the other (since dragging does not work without a mouse).