Words that double the consonant before adding "ed" typically include those that have a single vowel followed by a single consonant at the end, and where the final syllable is stressed. Examples include "stop" becoming "stopped" and "plan" becoming "planned." This rule helps maintain the pronunciation and integrity of the original word.
add adding addition
You use 'an' before words that start with a vowel (or a vowel sound), and 'a' before any other word. So in your example, it's 'AN energy crisis'.
arrowbarrowcarryearringharriedjarredmarrownarrownarratornarratenarrativeparrotquarrystarrytarry
Run, hop, sit, beg.
To be honest I'd focus on basic grammar before adding words such as vigorous.
ummm....... marry-marries
A Gerund is formed by adding -ing to the word. English has different rules about adding -ing. For example, words that end in a vowel or consonant; words that need a consonant doubled first; words ending in y. Examples: Add Adding (no changes before -ing) Abide Abiding (drop the e first) bed bedding (double the consonant)
When applying suffixes to words ending in "y" preceded by a consonant, change the "y" to "i" before adding the suffix, unless the suffix begins with an "i." For example, "happy" becomes "happiness" (changing "y" to "i" before adding "ness").
Withhold is one word that does.
Pantheresses. It is a perfectly standard formation: words whose singular ends with a double 's' form their plural by adding 'es'.
The past tense of "open" has one "p" because the word follows the rule for doubling consonants before adding a suffix starting with a vowel. When adding "-ed" to "open," we don't double the "p" since the word ends in an unstressed syllable.
A vowel that comes before a double letter is typically a short vowel sound. In English, this is often seen in words like "batter" or "dinner," where the short vowel is followed by the double consonant. However, there are exceptions and variations depending on specific words and their pronunciations.