<em>1. When broken, the material has a black, silken fracture. </em>
<span><em>broken - Participle II,
функция - обстоятельство времени </em>
</span>
<span><em>2. Iron oxide is the major problem when forging steel. </em></span>
<span><em>forging - Participle I,
обстоятельство времени </em>
</span>
<span><em>3. The film, made by Stephen Spielberg, is expected to be a great hit. </em></span>
<span><em>made - Participle II, определение </em></span>
<span><em>expected - Participle II, часть сказ, сказ стоит в форме Present Simple Passive </em>
</span>
<span><em>4. They watched the forest helplessly. </em></span>
<span><em>Причастия НЕТ!
watched - глагол-сказуемое в Past Simple </em>
</span>
<span><em>5. Owing to these methods it has become possible to obtain new mechanical properties of the alloy. </em></span>
<span><em>Owing - Participle I, обстоятельство </em></span>
<span><em>become - Participle II, часть сказуемого, сказуемое стоит в форме Present Perfect Active </em>
</span>
1 don t tell anyone this secret
2 don t carry that bag it is heavy
3 don t take your coat off it 's cold
1 mustn`t
2 must
3 must
4 mustn`t
5 must
6 mustn`t
7 mustn`t
1 have to
2 don`t have to
3 has to
4 don`t have to
5 doesn`t have to
6 has to