The masculine plural definite article 'gli' shows that you mean 'the hobbies' when your topic is 'gli hobby' in Italian. It's pronounced 'lyee'. The masculine plural indefinite article 'degli' shows that you mean 'some hobbies' when your topic is 'degli hobby'. It's pronounced 'DEH-lyee'.
Cylinders.
McDonald's
boats
Martinez's
cobwebs
You wouldn't pluralize "processing", but you would pluralize "process" making more than one process "processes".
Handkerchiefs is correct.
Fournesses is the plural of Fourness
Folisis is the plural of Folisi
Sirs is the plural of sir
Do you mean, "How do you pluralize the phrase 'follow God's word' ? 1) Follow the words of God, or 2) Follow God's words.
The plural form of panic is panics.