Explanations of happenings in one's life, causal explanations, are an important topic of study in social, psychological, economic, and behavioral sciences.
finally, according to visual inspection, emojis ('E' tag) are crucial for discourse relation in social media so we take them as separate discourse arguments (e.g.,in "My test result... :(" the sad feeling is caused by the test result, but it cannot be captured by plain word tokens).