Translate sentences in full page mode

I usually use my iPhone or IPad to read LingQ. Sometimes, I don’t know what I do, but it selects the whole sentence instead of just one word and offers me a translation and reads the sentence to me. This isn’t in sentence mode. How do I make this happen on purpose?

This isn’t any functionality on LingQ. I don’t know what you are doing but we only offer that in Sentence mode.