I've been working hard on this grammar topic but I still haven't fully figured it out.
1-) These are machines that take room air and extract the nitrogen, producing greater than 90% pure oxygen.
The word "producing" in this sentence is reduced relative clause (refer to "machines" ) or cause-result ( adverbial ) ?
2-) The drug disrupted the mechanism in the body, causing a heart attack.
The drug disrupts the mechanism in the body, causing a heart attack.
Is it necessary to have the past tense in such sentences ? Because only past tense examples are given in any book. For example :
The engineer fixed the problem, earning a promotion or She slipped on the ice, breaking her ankle.
3-) Our bodies can sweat, losing heat by evaporation.
Can this sentence be thought of in two ways? For example :
Our bodies can sweat and this ( our bodies can sweat ) causes loss of heat by evaporation
Our bodies can sweat and (our bodies ) lose heat by evaporation
I would be very grateful if you could help with examples and enlighten me. Thank you.