There are many factors that could hamper an effective communication. Some of those could be: social status (if you are talking to someone who has a more important status than yourself, it may happen that they are not interested in a communication with you), use of language (if you use inappropriate words, the conversation is not going to be successful), knowledge about the subject (if you don't know what you are talking about, the conversation is likely not going to continue), atmosphere/noise, cultural differences, disabilities, etc.
Answer:
There is good reason to be thankful.
E-V-S (Expletive-Verb-Subject)
Explanation:
Unlike most sentences, this sentence does not follow the usual pattern of Subject + Verb, instead, it begins with an Expletive, then a verb and lastly the subject.
<em>There</em> is the expletive because it is a word without meaning that does not add to the sense of the sentence, and that, instead, is inserted to give emphasis, it acts as an intensifier.
<em>Is</em> is a conjugation of the verb “be” in present and it indicates the existence of the subject.
Lastly, <em>good reason to be thankful</em> is the subject because it is the thing that is being discussed in the sentence.
She greets Harry warmly, and then stormily chastises her boys, setting them to work de-gnoming the garden.
