Tefl Grammer assignment

Hi all im stuck on this question and would really like some pointers or any sites that could offer me more examples.Being a practical person i usually get something by seeing it more in practice.
For parts (i )(ii)(iv) i am fine however im struggling to understand part (iii)Label the parts of the structure.
For each of the following five sentences:
(i ) Identify the verb phrase.
(ii) Name the structure.
(iii) Label the parts of the structure.
(iv) Describe the functional meaning conveyed by the verb in the sentence.

Examples:

I start work at seven every morning.
( i) start
(ii) present simple
(iii) base form
(iv) a routine

I was living in Peru at the time.
(i ) was living
(ii) past continuous
(iii) auxiliary 'be' (past tense) + present participle
(iv) an activity in progress at a specified time in the past