To communicate effectively, people must share a

Interest

Explanation:

If you don’t have the same interest or hobbies, you won’t have anything to talk about. This is just my thoughts though

Goal

Explanation:

People must have a common goal for communication

modal adverbs are used to modify specific verbs that consist of a linking verb (verb of being) and sometimes another verb. examples of modal verbs include can, could, may, might, must, shall, should, will and would.

modal auxiliary. an auxiliary verb characteristically used with other verbs to express mood, aspect, or tense. in english, the most common modal auxiliaries are can, could, may, might, must, ought, shall, should, will, and would. also called modal .

"facing the rising sun of our new day begun

let us march on till victory is won.",

because the rising sun is a symbol of hope.