Grammar app for iPhone and iPad

Quick Grammar Quiz.
Do you know right from wrong?
Do you know why it is so?
Choose the correct word for the following sentences:
1. I (lay/lie) my head on the pillow. (Present tense required of the verb, ‘to lie’ – transitive form of the verb).
2. I would (lay/lie) down my life for you. (Indefinite future tense – intransitive form of the verb ‘to lie’).
3. I could (of/have) said that to you. (Correct form of the verb or a preposition?).
4. (He’s/His) my best friend. (Correct use of the apostrophe or pronoun).
5. (Retirement) is looming. (Is this a gerund or a participle? Or, is it a noun?).

You can use this App to discern the correct answers and the reason supporting this decision.
Description:
Carry a reference library in your pocket anywhere you go. Get access to about 20,000 words that explain and give examples of English Grammar, literate writing and text types. If you are a teacher, choose from the ACARA outcome number or the actual term you are looking for. For teachers, parents and students, find examples of grammatical terminology that puzzles you and offers further demonstrations of the definition. Locate the listed Literacy Program Workbook that gives you ongoing practice in improving knowledge and skills in becoming literate in the English language. For people whose first language is not English, learn the skills involved in becoming a competent user of the English language. Develop your expertise by practising these skills and accessing the ICanRULE Workbooks listed with the grammatical terms you are exploring.
Choice of access:
• Linked to the ACARA English curriculum (Language and Literacy), this information is vital for teachers, parents and students to ensure well-written text – simply choose the outcome number.
• Don’t know the outcome number? Simply access the explanation via the term you want defined and explained.