A participle has the form of verb + -ing. So the only such word here is 'smiling' that is the participle in this sentence. It modifies 'woman', that is, it refers to how the woman opened the door - smiling pleasantly.
Answer:
Exercise 2:
just add 'ed'
: pushed and baked
take off the 'e' + 'ed' double the last letter: clapped
Exercise 3:
just add 'ed': played
take off the 'e' + 'ed' double the last letter: stopped
Explanation:
When we form regular verbs in Past Simple, we normally add the termination 'ed' to their infinitive form.
e.g. played, lived, baked, pushed, etc.
However, there are some cases when we must apply some changes to the base of the verb, in order to obtain an adequate past simple form. If a verb ends in a vowel and a consonant, we double the consonant before adding -ed.
e.g. clapped, stopped, planned, etc.
Explanation:
Architecture, the art and technique of designing and building, as a distinguished from the silks associated with construction...
Answer:
Calcium carbonate reacts w/stomach acid according to the following chemical equation.
CaCO3+2HCl(aq)-> CaCl2(aq)+H2O(l)+CO2(g)
