Present Progressive

Which one of the following items is the first that you need to form the present progressive. 

• a pronoun
• the verb "to be" in the present
• the suffix -ing
• a verb in the infinitive form

Which one of the following items is the second one that you need to form the present progressive. 

• a pronoun
• the suffix -ing
• the conjugation of the verb "to be" in the present 
• a verb in its infinitive form

Which one of the following items is the third that you need to form the present progressive. 

• present tense conjugation of the verb "to be" 
• a pronoun
• the suffix -ing
• a verb in its infinitive form

Which one of the following items is the fourth one that you need to form the present progressive. 

• present tense conjugation of the verb "to be"
• a verb in its infinitive form
• the suffix -ing
• a pronoun 

Which of the following has the correct order of the items needed to form the present progressive?

• present tense conjugation of 'to be', verb in its infinitive form, suffix -ing, pronoun
• pronoun, present tense conjugation of 'to be', verb in its infinitive form, suffix -ing
• suffix -ing, present tense conjugation of 'to be', verb in its infinitive form,  pronoun
• verb in its infinitive form, present tense conjugation of 'to be',  suffix -ing, pronoun