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Electromagnetic waves are:

If sound is 10 times more intense than sound , what is their difference in sound level (dB)? Δβ=10log⁡(I1I2)

Which words are part of the complete DIRECT OBJECT of this sentence and have to be REPLACED by the DIRECT OBJECT PRONOUN?  Yo estudio las grandes civilizaciones mesoamericanas.

Which PREPOSITION must be used when a second verb in infinitive form follows the verbs EMPEZAR or COMENZAR?  Yo empiezo ____ trabajar.  Yo comienzo _____ trabajar.  BOTH OF THESE VERBS ARE STEM CHANGING VERBS.

Which of the following verbs is a REGULAR – AR verb?  The other three are IRREGULAR – AR verbs that do not follow the conjugation patterns that REGULAR – AR verbs follow.

Some of the uses of the verbs SER and ESTAR can be remembered by using the acronyms DOCTOR and PLACE. Look at the acronyms below. Look at the sentence below. Then pick from the four answers choices given to you and choose the description that matches how the verb SER or ESTAR is being used in the sentence. SENTENCE: Marisol es baja de estatura y delgada. VERB SER Description Occupation Character trait Time Origin (DE) Relationship ____________________ VERB ESTAR Positions Locations Actions Conditions Emotions

Which sentence using SER is incorrect?

Which of the following words means DAD?

Which of the following sentences shows the correct SUBJECT PRONOUN + VERB TO BE (SER) FORM for the sentence below? [Professor Solano] is my Spanish teacher.

Which of the following sentences uses a correct conjugation of the verb VENIR in present tense?  A correct conjugation will show the subject / subject pronoun that correctly matches the verb form being used in the sentence.