After reading each sentence, we can fill in the blanks with the correct form of the verbs given in the following manner:
is / has been
was still sleeping ? went
will have
was / Did you see / had
returned / had parked
has been wearing / loves
was preparing / arrived
has been walking / had
happened
arrived / had already started
came / saw / had been drinking
Have you heard / got / have known
have tried / have you been
is speaking / will see
are standing
will take
has forgotten / have expected
comes / starts
looked / came
had / was really enjoying
The sentences we are supposed to complete use several different verb tenses. Let's break down the uses of each of them:
The simple past tense is used to talk about actions that happened at a specific time in the past. Example: I <u>left </u>home for work at 7:45 this morning. I arrived late.
The present perfect tense is about actions that started in the past and continue into the present. It is about actions that happened at an unspecified time in the past. Example: I <u>have worked</u>for this company since 2009. / I <u>have been</u>to Japan before.
The presentperfect continuous is used to emphasize the duration of an action that started in the past. Example: She <u>has been studying</u>Korean for 5 years now.
The simple future is used to talk about unplanned actions that will happen in the future. Example: I think I <u>will call </u>Jim now.
The present continuous tense is used to talk about actions that are happening at the moment of speaking. Example: Jane<u> is cooking</u> us dinner now.
The past continuous is used to talk about actions that lasted a while in the past. Example: Jane<u> was cooking</u> dinner when the phone rang.
I know the answer is NOT C "During one great period of immigration--between 1891 and 1920--our nation received some 18 million men, women and children from other nations. The hard work of these immigrants helped make our economy the largest in the world."