Which sentence correctly uses the present perfect tense? a)by next tuesday, i have called everyone on my list. b)last night i have left a voice mail message for my sister. c)i have made a few phone calls to try to obtain the information. d)i have planned to call but then i decided not to.

The answer to your question would be that the sentence that uses the present perfect tense correctly is the following one: I have made a few phone calls to try to obtain the information. That is, the correct option would be C.

The sentence shows a correct use of the present perfect tense because it refers to a past event related to the present. The speaker has made a few phone calls and now he/she has the information he/she needed.  That is, the past event relates to the current activity, topic, or conversation.

what motivates odysseus to tell a lie to the cyclops

some attention getter quotes to support your thesis regarding brain work could be the following: :

a. storage capacity of your brain is virtually unlimited.

b. your brain produces sufficient electricity to light-up a small bulb.

c. different brain circuits are involved with reading aloud or silently.

d. your brain by itself does not feel pain.

e. reading allows your brain to download info directly.

f. brains of two musicians performing together can synchronize.