I m smarter than Nikita
I m taller than Oleg
I m faster than Max
I m stronger than Denis
I m slower than mark
~1~How long___of this injured bird (you/take care)?
`1`How long <em><u>have you been taking care.</u></em>
<em><u /></em>
~2~Maria___study English for two years.
`2`Maria <em><u>has been learned </u></em>study English for two years.
<em><u></u></em>
~3~He___in Tokyo since February 18th.
`3`He <u><em>was </em></u>in Tokyo since February 18th. (Об этом не уверена)