Idiomatic usage: dated at vs. dated to

Most of the time

dated at denotes a time period. (dated at + number of years)

dated to is followed by a date. (dated to + date)

Incorrect: Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs have been dated to be 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth. 

Correct: Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs have been dated at 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth.

Note: dated to be is unidiomatic

Idiomatic Usage: grounds for

grounds for (something)

The basis for some action or decision, often one that is disciplinary or legal in nature.

• Be careful now—plagiarism is grounds for expulsion.
• Your negligence is grounds for a lawsuit. 
• Is infidelity grounds for divorce in this state?

introduce to vs. introduce into

introduce to: to present someone to someone else for the first time so that they can become acquainted

• I would like to introduce you to my cousin, Sarah.
• We proudly introduce to you the Dutch team.
• Let me introduce you to him.

introduce into: to put something into use for the first time, or to put something into a new place

• New computers have been introduced into the office.
• The grey squirrel was introduced into Britain from North America.
• Fuel was introduced into the jet pipe.

each other vs. one another

The reciprocal pronouns "each other" and "one another" are used to show that people do the same thing, feel the same way, or have the same relationship.

Use each other when there are only two people or things, and one another when there are more than two.

• The two companies are in competition with each other.
• Sarah and Sam have had a big argument and now they're not speaking to each other.
• Emily and Neal looked at each other.
• I and my best friend talk to each other every day.
• Rose and Gina never liked each other.
• We sent New Year cards to one another.
• The triplets dislike one another.
• The dog, cat and bird looked at one another.
• Apes spend a great deal of time grooming one another's fur.

Apostrophe: Quick Tips 2

The apostrophe (') is used in nouns to show possession.

If the plural form of the noun ends in s, add the apostrophe (')

Plural	Plural Possessive
boys	boys’
girls	girls’
ladies	ladies’

Sarah excused herself to use the ladies’ room.

Note: The sign of the possessive case is always added to a word. It is not something that is inserted within a word.

Apostrophe: Quick Tips 1

The apostrophe (') is used in nouns to show possession.

If the plural form of the noun doesn't end in s, add the apostrophe and s.

Plural	Plural Possessive
men	men’s
children	children’s
mice	mice’s
teeth	teeth’s
women	women’s

Note: The sign of the possessive case is always added to a word. It is not something that is inserted within a word.

Usage: advise...to vs. advise that

Use advise...to when the sentence is giving advice directly to someone or something. If you advise someone to do something, you tell them what you think they should do.

• I advise you to go home. (I am giving this advice directly to you.)
• Sam advised Sarah to sell her car. (Sam advised Sarah directly)
• The minister advised him to leave as soon as possible

Use advise that when the sentence is giving advice not directed at any particular person or thing.

• Experts advise that sunscreen should be reapplied on an hourly basis. (The experts are not giving this advice directly to people; the advice is being given to all of us.)
• Experts advise that investors sell their stock in the company. (The experts are not giving this advice directly to the investors; the advice is being given to all of us.)