State the "Tenses" :
1) If it rains like this for a few more hours, the roads will all be waterlogged.
2) He will have finished reading the book by evening.
3) what was he doing when she came?
Study this site.
http://owl.english.purdue.edu/owl/resource/601/01/
I'll be glad to check your answers.
The sentences you provided involve three different tenses:
1) "If it rains like this for a few more hours, the roads will all be waterlogged." - This sentence is in the future conditional tense. It describes a hypothetical situation in the future, suggesting what will happen if it continues to rain like it currently does.
2) "He will have finished reading the book by evening." - This sentence is in the future perfect tense. It describes an action that will be completed before a future point in time. Here, it suggests that by evening, he would have completed reading the book.
3) "What was he doing when she came?" - This sentence is in the past continuous tense. It describes an ongoing action that was happening in the past when another event occurred. In this case, "what was he doing" refers to an action that happened before "she came."
To determine the tense of a sentence, you can identify the verb and its form. In these sentences, the usage of "will," "will have," and "was doing" indicates the respective tenses.