Shift and a cursor move key selects the text, ctrl and a move key moves one word or one paragraph so if you hold down both ctrl and shift what do you think a cursor move key does? Selects to the next word or paragraph.
Have a go at selecting words or paragraphs: type some text into Word or an e-mail then click somewhere in the middle to put the cursor there. Press and hold the ctrl and shift keys then try the right and left cursor move keys. The cursor moves to the start of the next or previous word. Pressing the same key again selects the next or previous word and so on. The up and down keys with ctrl-shift does the same but to the start of the next or previous paragraph.
Enough of the cursor move keys. Next, some of the other odd keys on the keyboard.