| Word | Part of Speech | Example Sentences |
| lack lacks | verb -
I/you/we/they lack
he/she/it lacks
singular noun + lacks
uncountable noun + lacks | - They lack the necessary family support or any other channels where they can seek assistance.
- Deprived and disadvantaged families lack both knowledge and self-confidence.
- A child without parents usually lacks a sense of security.
- The government overall lacks dynamism.
- It was so interesting to see how Western thinking lacks creativity and is not geared to changes.
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| lacking | adjective | - Financial backing for the programme is still lacking.
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| lacking in | adjective | - It was a solidly built vessel but lacking in navigating instruments. (A vessel is a boat or ship.)
(Grammatical structure: 'lacking in' + noun phrase.)
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| lacking | '_ing' form (present participle) | - Lacking any filial piety, Prince Richard rebelled against his father. ('filial piety' means 'respect for parents')
Sentence structure: 'Lacking + noun phrase + comma + clause
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| lacking | '_ing' form
(reduced relative clause: the relative pronoun e.g. 'who' and the verb are missing) | - Students lacking a dictionary can use an online dictionary.
(Meaning: Students who are lacking a dictionary can use an online one.)
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| lacked | verb - perfect and past tenses | - His leadership has lacked imagination and aggression.
- He said that Hongkong lacked "a long-term authority that monitors tree-planting efforts".
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| lack of | noun | - Social workers blame the Government for the severe lack of residential places.
- There's been a lack of awareness about what young people like.
- Most landslips are caused not by design deficiencies on slopes, but by a lack of supervision and control.
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