Circle the underlined part that is incorrect in each of the following sentences. Then correct it

This conference focused on discuss local and regional issues.
1. This
2. focused
3. discuss
4. issues
Organise the ASEAN workshop was harder than I expected.
1. Organise
2. workshop
3. harder
4. expected
His job involves to translate documents about ASEAN events.
1. involves
2. to translate
3. about
4. events
I am thinking of participate in a youth competition.
1. thinking
2. participate
3. in
4. youth