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There are different spellings of words across dialects of Igbo. Any spelling you learn is not necessarily the correct spelling of a word, simply one acceptable spelling.  Igbo written language is phonetic, so for the most part you will be okay if you learn the pronunciation of letters and write a word as it sounds. If vowels have either a dot under the letter or an umlaut above, this indicates a different pronunciation of that letter. New Standard Orthography uses an umlaut, but you may see previous versions in writing. In Igbo, personal pronouns are either separable or inseparable. Inseparable pronouns are singular, and appear in combination with the verb.  For example, bi means "live." If you want to say "I live," it would be ebi m. For first person singular, the letter "m" follows the verb stem. Separable pronouns can be used as a subject, direct or indirect object, or to show possession. For example, the Igbo word anyï can be used to mean "we," "us," or "our." The word itself does not change regardless of how it's used. To conjugate verbs in present tense, give them a prefix that harmonizes with the verb stem vowel. Use an a- before a vowel stem with an a, ï, ö, or ü vowel. The e- prefix harmonizes with i, e, o, or u vowels.  For example: ebi m (I live). You don't have to harmonize the vowels if you're using separable pronouns. Simply use the verb stem. For example: anyï bi (we live). Igbo verbs do not distinguish between past and present tense. Rather, suffixes are used to indicate when the action took place.   The suffix -tara or -tere is added to a verb stem to indicate an action occurred in the past. For example: ö zütara anü (he bought meat). Choose the suffix form to harmonize vowels, not for gender or any other reason. In Igbo, nouns do not change form if they are plural. You can identify whether a word is singular or plural by looking at the words around it. Number words are found after the noun, while ordinals precede the noun. For example: ülö ise means "five houses." The word ülö means "house" while ise means "five." Look for an Igbo or Nigerian community group near you and see if they have any language resources available. Ideally, you can perfect your language skills by working with someone who has native fluency.  If you find someone who is trying to learn English, you might be able to work out an exchange in which both of you help each other practice. Helping a native speaker learn English will also help you understand the grammatical structure of Igbo. They may make mistakes because some aspect of English grammar is absent from Igbo grammar. For example, they might say "five house" instead of "five houses," because in Igbo the noun form doesn't change when pluralized.
Recognize patterns of spelling. Distinguish separable from inseparable pronouns. Attach an a- or e- prefix to a verb stem for present tense. Add a suffix to specify tense. Use number words to make nouns plural. Practice talking to a native speaker.