Curso TOEFL TEST :: Evaluation # 2

LOS CURSOS DE INGLES GRATIS PREFERIDOS POR LOS HISPANOHABLANTES

 

SECTION 2: STRUCTURE AND WRITTEN EXPRESSION
 PART A: STRUCTURE

LESSON # 30

Logical conclusions

S                must have    participle         past time

My friend     must have       called              last night

S                  must be         -ing             present time

My friend      must be         calling                 now

S                     must     verb word      repeated time

My friend         must             call                   often

Remember that an observation in the present may serve as the basis for a conclusion about something that happened in the past,

For example, "here is a message on my desk." It may be concluded that "my friend must have called last night."

Avoid using should or can instead of must.

Avoid using a verb word instead of have and a participle when referring to a past occurrence.

EXAMPLE:

Incorrect:

The streets are wet; it should have rained
last night.

Correct:

The streets are wet; it must have rained last night.

USEFUL LINKS in our megaportal:
OM Company - Should Have / Could Have

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