Verb conjugation of "infiltrate" in English

Place the cursor (using the mouse) on the section which you want to delete. Hold down the 'Shift' key and press the 'PageDown' key or the bottom arrow key. The document should then be marked in blue.
Take your time to answer me, do the vocabulary exercises and measure your progress! Your answers will be kept in the system itself. After that you can look at the statistics. That's pretty cool here.
I am glad you know, I have learned Czech and my English is also not that bad, but we could speak in German. I got your message and I want to apologize again. Next time I will do it more accurate.