Grammar
Simple past or present perfect?
They have already written three letters
Present perfect
What is an ecosystem?
Describes a single environment and every living (biotic) organism and non-living (abiotic) factor that is contained within it or characterizes it.
What type of adverb are these?
slowly, loudly, carefully, well
Time-Frequency-Place-Manner
Adverbs of manner
Say the number
12, 768
twelve thousand, seven hundred sixty-eight
Simple past or present perfect?
Last year, I traveled to Japan.
Simple past
What are the biotic factors?
are the living parts of an ecosystem. These include animals, plants, algae, and fungi.
What type of adverb are these?
outside, here, downstairs, there
Time-Frequency-Place-Manner
Adverbs of place
Say the number
234, 629
two hundred thirty four thousand, six hundred twenty-nine
Simple past sentence
He / not wash/ his car/ yesterday
He didn't wash his car yesterday
What are the abiotic factors?
are the nonliving parts of an ecosystem. Abiotic factors include soil, air, water, temperature, wind, humidity, etc.
What type of adverb are these?
yesterday, soon, later, tomorrow
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Adverbs of time
10, 009
ten thousand, nine
Present perfect sentence
He/not finish/ his homework/ yet
He hasn't finished his homework yet.
Name two human actions that harm or destroy ecosystems
Cutting down trees
Building hydroelectric power plants
Constructing overhead power cables
Pollution of the atmosphere, rivers, and oceans.
What type of adverb are these?
always, sometimes, usually, never
Time-Frequency-Place-Manner
Adverbs of frequency
2, 765, 045
two million, seven hundred sixty-five thousand, forty five