<font color="#ff1493">How should I end this sentence: do you know when...</font><br/><br/><font color="#ff1493">a) will your father arrive?</font><br/><br/><font color="#ff1493">b) your father will arrive?</font><br/><br/><font color="#ff1493">c) your father arrives?</font><br/><br/><font color="#ff1493">d) your father has arrived?</font><br/><br/><font color="#ff1493">And why?</font>